I'd consider none of them top class. I'd much rather sign Sancho, who can play all 3 positions behind the striker and is actually top class. Imagine having the posibility to bench/rest Rashord, Greenwood or Bruno and bring them on later in the game. That would add a lot more than having Memphis or Zaha in the squad who will be expensive on their own. We'd improve our first team and our options to rotate. We've seen this week Fred can do a shift filling in for Matic. We have McTominay too. Can we improve those positions, yes. Do we have rotation options, absolutely. Do we have rotation option in attack? Hardly. In defence, even less.
Get Sancho, a CB and a young talented LB, sell Smalling, Jones, Rojo, Dalot, Lingard, Pereira, TFM and Romero. Promote Laird (or play Williams on the right), Mengi (if Tuanzebe can't stay fit) and Henderson. Excellent window.