How big an upgrade Sancho is on either of Rashford or Greenwood is yet to be seen. I have belief in Sancho too, but its not a blind belief. Things can go "wrong" and have gone wrong before. I will liken it to City getting Grealish despite having Sterling and Foden, until Sancho proves otherwise and becomes much better than them both. Grealish right now is a starter at City.
However my point was more about how CM was the more immediate need than CB or RW, consider we still had decent options there(Lindelof or Greenwood) rather than at CM(Matic, Fred, McT). Similar point can be made about City's midfield options vs CF. Its less about how much an upgrade the new signing is, and more about which was the more necessary signing.
Laughable. Grealish was the third best creative midfielder in the PL last season, behind only KdB and Bruno. Stats back this up, the eye test does too imo. I'm one of Pogba's biggest fans in this forum probably, and I do think he can be better than Grealish if he consistenly is given a chance at LW, but he is not, due to many reasons. Pogba has more attributes(versatle, aerial ability and passing range) but Grealish is a much better dribbler, at carrying the ball, more press resistant and much more creative(only behind KdB last season). There's not much between them, they are both top midfielders imo, but on last season's form Grealish edges it for me, albeit slightly.
And this is coming from someone who thinks Pogba being inconsistent is a myth, and regularly mocks people on Caf who thought we should have sold Pogba for 30-40M this season(there were lot, which tells you about his stock here).