Assuming Hunter and Mitchell do not return and Tre stays with Texas, then:
the team is now one PG and one BIG away from a potentially decent eight man rotation.
Gerry has pointed out that if it is the Okie Lite Big he is a back-to-the-basket guy who must be surrounded by shooters, and these three fit that description. Better, as Gerry has also pointed out, would be adding two BIGs, one of whom is a stretch 4. Question for Gerry: Can Kent suffice as a stretch 4? [I tend to think not, but a versatile long wing is still a good mix on the floor].
If Hunter returns I think he becomes a situational sub and not even the 7th man. He does not solve for the lack of a good PG, as he is a shooting guard in a small package, wildly inconsistent on offense and a poor decision maker. His defense is generally very good and he hits his foul shots. Good energy, but no Weaver. Pure sub on a balanced team.
If Mitchell returns I think he may become a situational sub as well, but with more possibilities to play than will remain for Hunter. He is an excellent defender and a fine rebounder, but a limited shooter, as we all know, not a true stretch 4. If everyone else on the floor with him can make space he becomes dangerous on offense because he moves very well without the ball and can take advantage of spacing. There might be a mix and match combination among the new three, Tre, and Shedrick that would showcase Mitchell's offensive talent.
Weaver will probably get starter minutes next season even if he is the anointed gem of a sixth man. He will make his own upside. If Weaver's range on his shot improves, and there is some reason to believe it will because he shot better as a freshman, he would become a star. If it does not, spacing provided by the others will still spin gold for Weaver on offense.
Summary: these three additions should seal Hunter's decision to leave. The right 2 [or 3] additional in - portals will determine the ceiling for next season. I think a decent floor has been set.