I think we'll see a shift in playing style with the more technical players we get through the doors. Currently, Martial, Rashford, Fernandes, Pogba with Sancho added would lend itself to short-passing, one and two touch, combination football with a lot of movement and positional interchange.
Pogba out, and another player in who can pass along the deck (at least) and the same formula can be executed. Sancho can play across the frontline (that much is becoming apparent with his forays infield of late) as too can Rashford, and Martial drifts anyway - the constant would be Fernandes running through the middle behind them.
I don't think we'd commit to such outlay without a plan in place on how to utilise the player, personally. He needs good, technical footballers around him who can give a pass as well as receive one and not break passing chains down and he also needs confident off the ball runners. If it's felt we don't have either of those things here, we'd better be looking to address that in supplementation to a such a player coming in, but I believe we've got the components and a player like Sancho would knit a lot of football together - it wouldn't surprise me to see him given a solid share of play-making responsibilities from a wide position ala Silva, Neymar, Ronaldinho, Hazard, Zidane, Nedved and so forth if Pogba goes, too.