Him more than anyone else outside of maybe Jared Goff. McVay is a premier TE coach and will strongly benefit the TE position through scheme and detailed preparation. Whoever ends up with playing time from these guys is going to have every opportunity to excel.
I really hope Higs takes advantage. His friendship with Goff isn't gonna hurt either btw, nor does the fact that he's got his typical TE rookie season out of the way, so he's my bet as "that guy" from the previous regime who is the unheralded difference maker.