I didn't want Sanchez because I wanted Sane & Sterling to develop, which they have, but imo, all the attackers are suffering from the incredible amount of physical & mental effort they have put into this run. In actual fact, wheras he might have been a spare part for most of the season, we could have done with Sanchez this week, when all are a little bit jaded.
A new spark is not essential, but it could be pretty fucking good.
It may cause a bit of resentment from Sergio in particular, if he has to miss out more, but with a Premier League title dangling like a ripe peach, plus a possible crack at the Champions League, & two cups, would you really want to sulk & risk missing out on it all, or would you rather fight for your place & do your whinging in May, once it's all in the bag ?
Imo, the player most worried should be Bernardo Silva, anyhow. He is very much a 'stand in' for Sane, Sterling etc right now wheras Sanchez would be a genuine alternative, not a 'stand in'. Sanchez could eclipse him completely if he hit the top form immediately.
Also, if you were looking for a player to adapt, drop back & do the kind of new baldy toughnut playmaker job David Silva now does, Sanchez is a much tougher unit, than Bernardo & has been trained already by Pep, so imo there could be another string to this bow IF it happens.
No lose either way now for me. We are great with or without him.