UNSC nor covenant will be in New trilogy

Community Halo Universe
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This is something that has just came into my mind, please fully read and understand the post. Please don’t come in here acting childish without saying anything that has some sort of merit.
Frankie said during E3 (which you would have had to see live to know about) That “no purple” will be in halo 4, frankie then said " you won’t need to play the new trilogy to get this one" so let me break that down.

The covenant used purple as a color pattern thus any time we saw purple we thought of the covenant, there are also people (most people) that call any of said raves about of it “covenant” instead of their actual names. Thus by him saying “no covenant” he was saying that has a whole without going off an naming each race that was part of it. And we also know by the end of halo 3 that the covenant is disbanded; so the only meaning frankie could have for that is the single races of such “covenant”.
He then said “you won’t need to understand the last trilogy to get this one” so even if the “no purple” were to be ignored (like some people are trying to) this line still stands. If any of the covenant races were to show up then that would be confusing for a new player and they wouldn’t get how that ties in to the story being told (neither would i). NOw if they were to show up as an easter egg or something that is a ok. But we have clear confirmations that the “current” story will not be carried over.
But i do have a spark for you “covenant” fans. The only races that could be in the trilogy without being a Drag are the lekgolo “hunters” and the engineers, why? The forerunners created the engineers thus it would be fine to see some, The legkolo were also around during the time of the forerunners but they saw them as just worms (which is all they were at that point). That being said those are the two “covenant” races people should be hoping are in.

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Now to the UNSC

Now Halo 3 ends december 11 2552 in which the covenant is disbanded (point 1) and the chief is floating in space declared MIA.

Now Halo Legends Origins takes place roughly 4 years later nearing cortana’s 7th birthday and due to the nature of AIs being deleted around that age because of ramapancy that puts halo 4 roughly 5 years after halo 3.

so lets break this down

january 2553 -chief is still missing (evolutions iqbal’s letter)
September 2556- A musical is held for the missing hero chief
sometime after november- Cortana talking in origins happens, they are still missing
2689- This is the year the encylapedia (spelling its early) states the chief is still MIA if the other marketing sources were to be ignored (which they shouldn’t due to a monument being built)
2607- a monument to the chief is being built for his service to mankind, he is still MIA (and unless something un-heard of happens cortana is long “dead” by this point").
2610- The monument is completed and chief is still MIA
So all things accounted for chief is still MIA 50 years after the war in which unless cortana is put into a body or forerunner upgraded she will be “dead”. the encalapedia states that he is still MIA atleast until 2689.

Now to stop a cop-out i forsee being brought up; Halsey eulogy means nothing despite halopedian saying “they got out”. There are several movies and shows in which somebody dead (desparate housewives), nonexistant,etc narrates the story. So until we have confirmation that they got out we know nothing.