Before we start, this is hypothetical, and in no way going to appear in Halo 5, and most likely not in Halo 6. But I still intend to post this “suggestion”/idea for a Warzone gamemode/change. Keep this in mind, as this is also not confirmed leaks or anything of the sort.
So, onto my idea for something I’d like to call “Warzone Conquest”
I’m sure some of us are familiar with the Battlefield commander mode? Where if the players captured control points you could use abilities, drop vehicles, or mark targets for elimination. Ofcourse that was designed for Battlefield, and it didn’t end too well with Hardline, and never continued in the newest of Battlefields.
But we already have a top down game, designed for controlling units and using abilities… Halo Wars 2.
My idea is that a new gamemode for Warzone could be made called Warzone Conquest. It would of course take place in normal warzone maps, but would go down far differently as both Halo FPS players, and Halo Wars 2 players would be in the same battle.
General Info
For the Halo FPS players, it will be mostly normal, aside from certain buffs a Halo Wars 2 player could drop you would play the game normal, but there would be larger conflicts between AI (as there is one HW2 player per team, who control AI to fight with), and the AI would be smarter due to specific player control.
The score to win as of now would be 2500 due to other reasons described below.
FPS Players
Gameplay for Spartans will be relatively normal, capture bases, kill AI, destroy the core etc. But there will be marked objectives on the map, that if captured will give the HW2 players extra resources or a small buff (for example +5 unit limit up to a max of +10). The HW2 player will be able to make a spartan their dedicated spartan (described later down) and will also be able to mark enemy units or players for elimination. AI damage on FPS players will be toned down from the normal extreme amounts of damage to make up for the larger unit count.
Some units spawned in by the RTS player will be marked as bosses based on their level (ultimate units and some rare units). The Spartans will be able to kill the unit for points as if it were a normal boss, although it will be defended not only by rts controlled AI, but enemy Spartans too. If the unit is not killed in maybe 3 to 5 minutes, the boss icon will go away and it will be a normal unit (although if the unit is a legendary as described later, it will not lose the boss icon ever, but the icon will fade if not in LOS)
Map Objectives
Scoring 2500 points will be the main way to win, killing a core is able to occur, and the normal points awarded for killing Spartans or owning a base will also be present. But a line will be placed somewhere on a map to mark the main “battleground”, this is the line of conquest. (Think For Honor). AI units will automatically spawn and duel it out to cross the line and hold it, Players will be told to kill AI that are around the line in order to help their AI push the line of conquest. The HW2 player will be most dedicated to helping reinforce or capture the line, their units will be able to capture the line but Spartans will not be able to (by killing AI they allow their own AI to push). After gaining hold of the conquest line, the generic AI spawns will begin to take cover behind boxes and various other blockades in order to get a better hold. At the same rate that bases give points the line will give 1.5 per rate, so it will be worth more than having one base.
Depending on the map, there could be more than one line of conquest. Per match there will only be one, but just as boss spawns change, the line of conquest can be different each match.
Line of Conquest
AI Benefits for players
Not only will the AI controlled by HW2 players fight for the Spartans, but a HW2 player can select a squad of AI and tell them to follow the player. 3 players max can be followed, and can only be followed by infantry. One squad per player (max of 3 squads on players at a time). One a squad is given to a player, they are removed from the HW2 unit limit, and can no longer be controlled. If a Spartan doesn’t want AI with them they can remove the squad at any time with a req station by going into the menu and either disbanding the squad, or blocking themselves from ever being given squads again (in order to prevent griefing). The units given to a player will have arrows above their heads with a colored icon to show ownership for the player (and only the said player can see this). If a player goes into a cooperative vehicle (warthog, tanks, etc) the units will attempt to enter it with them (in gunners or passenger seats, never driver). If another player wants to get in, they can hop in as if nothing was in the vehicle and the AI will be kicked out.
Notifications
The HW2 players will be able to use a dialpad to notify Spartans that they need to Defend, Attack, Retreat, or that there is danger. Spartans will see this as an icon in the sky and will see another icon on their minimap to show which direction/where it is. The icon will also appear and blink in the top left corner of their screen if they are within the zone of effect. The HW2 player will not be able to spam a notification multiple times in one spot, and if they spam more than 4 in a short duration a small block is put on temporarily.
Yes I know it’s not the best made idea, but just think about it, it fulfills the wants of the HW2 players who want to “control a unit on the ground” and the FPS players who want to fight in a battle where two sides of massive amounts of units are dueling it out. It also allows greater conflicts for both fan bases and pulls them together for a major game mode.
Or maybe even make a blitz variant of this for weekends 
Also sorry for my rambling on, I didn’t go and revise my word structure too well.
Disclaimer : The RTS description will be present in a comment below, 7500 letters was not enough for the entire post!