Marvel Phase 4 Revealed?
Let’s start where it matters. Marvel. Agents of Shield, the only T.V series directly linked to the Marvel Cinematic Universe MCU.
Therefore it is only logical that the events of season 6 are an integral part of what comes next with the MCU.
First of all Phil Coulson is back. Now is he is referred to as ‘Sarge’ and seems to be on a ruthless planet destroying mission with some specific assassination tasks on the side.
The question then is
IF: Agents of Shield takes place in the same Universe of the MCU
AND: Alternate realities occurred as a result of the Infinity stones (particularly the Time Stone) being temporarily taken from the past.
THEN: it is perfectly feasible for a Phil Coulson from an alternate reality to want to come to the primary MCU timeline to put things right.
So now comes the next question. Put what right?
IF: Alternate realities occurred as a result of the Infinity stones (particularly the Time Stone) being temporarily taken from the past.
THEN: There are alternate versions of Earth, Marvel superheroes and the Universe.
AND: in one of those Universes, Captain America remained to live with the love of his life, Peggy Carter.
AND: In one of those Universes Loki has disappeared with the Space Stone.
So IF: Phil Coulson has returned to put things right, then perhaps we are heading into the Marvel Illuminati Phase where the fate of All Realities are at stake and Phil Coulson is from an alternate reality SHIELD, arrived in our reality to restore the multiverse balance.
This would allow the introduction of Professor X from one of those other realities and Prince Namor the Sub-Mariner from the main Marvel Earth 616 we are all used to.
After all, what could be bigger than the destruction of half of all life in our universe other than the destruction of all universes?
Perhaps Phil Coulson has arrived here to prevent that from happening.
And the X-Men and other mutants also arrive with the same intention and so we get a mash up of Avengers V X-Men in the context of saving the Multiverse.
Of course, somewhere along the line the Professor X teams up with the other big brains to sort out some alternate less multiverse-destruction solution