We shouldn't be signing any back-up players. Every signing going forward should be to take the spot in the first XI, and to relegate those currently starting to a backup role or to be sold. All top clubs go about their business in this way.
In terms of what we need, hopefully we can get a CM sorted this window. A top player who can contribute as a #6, is the right age and profile for a club like Man Utd. We have been linked with a plethora of players so hopefully discussions are ongoing and we can conclude a deal in the next week.
A number 10/RW will most likely happen in the summer. We should be going for top quality players in both positions. Sancho, Grealish, Bruno Fernandes, Maddison etc.
If Pogba stays, then we probably won't need another CM and can press on with other issues. A #6, #10, Pogba, McTominay, Fred should be good enough for 3 positions to let us focus on other positions.
A CB is still an issue for us I feel. I doubt Lindelof will ever be good enough to start for a title winning team in the PL. Jones needs to go, Bailly and Rojo the same, and a new CB should be brought in, Lindelof relegated to a back-up option with Tuanzebe.
A GK is the next issue after that. De Gea's form can't be put down to a bad run of form now, his standards have clearly dropped, opposition teams are targeting him on corners/crosses and free kicks. and he's making more and more howlers. He still produces excellent saves and games but we should be scouring Europe for our next GK or even bring back Henderson and give him a chance. If not, someone like Onona would be a great addition.
Haaland would have been a good addition as a strike. Young, talented and a different option to Rashford/Martial. Can't really see many options out there now or in the summer so I think we will stick with what we have got and give Greenwood more minutes. Hopefully with the correct number #10, we can add 10-15 goals a season.
RB should be fine with AWB, Dalot and Laird for now.