I didn’t see a thread on this but I just don’t believe 343 went through all the trouble of making a battle pass/tier system with skins and awards for MCC and its not a way to get ahead of people asking for it after Infinite releases with a similar system. I think its pretty clear that it will be in Infinite and MCC was a “soft” launch to test the waters for a Battle Pass/Tier system with the older games. It falls in line with the new engine being capable of making updates/fixes to the game much faster than was possible with Halo 5. You’d need to be able to update the game frequently to have a battle pass/tier XP system that add new content after every 4/5 weeks or so.