Sancho is special and he can provide us something different than what we have, it would be good to have him.
I like what Ole is doing with the squad now. We now have Bruno, and maybe Pogba, if not, we would have replaced him with one of the 2 players linked with (Maddison, Graelish...). But let's suppose Pogba stays, we need players to benefit from the passes.
Those players can potentially be:
Rashford, James
Martial + one back up
Sancho, Greenwood
Different options for different games. This could be phenomenal attack wise.
My only point was that I don't see why only United would be ahead, unless Sancho has shared something to us. But we wouldn't know. Maybe Ole or the club does.