QB - Mahomes will be the only 99 for a while, so with +3 boosts, I think he is best RB for a while
RB - Beast Mode can get 99 speed and angry Run X Factor, so with +3 boosts, I think he is best RB for a while
TE - Casper - Great Route running and +3 speed boost, I think he is best TE for a while, unless you have a run only scheme and use Heeeeeeath
Pitts - 98 Speed, great option for backup TE
WR - Deebo, Plax, Torry Holt - all around 97 overall with boost and 99 speed
OLine - Superbowl theme team is lacking, but you can still get70 superbowl chem with only Whitworth
DT - Sapp, with light up token, best DT in the game
DE - Chase Young, George Karl - with +3 boosts and discount ablities - best DEs for a while
Then add in Night Trane, Mel Blount, Lott, Kam, Howley, Jayir Brown - all with +3 speed boosts and either 0 AP Pick Artist or 0 AP Lurk Artist, plus your 2 deep safeties get 2AP Deep Zone KO
Honestly, outside of OLine upgrades, if you are running superbowl theme team right now, you dont need to upgrade any core positions until like 98 overall players come out or there are some 0AP glitch abilities/XFactors on other players?