We can play a diamond which I believe can suit Pogba, Fernandes, Grelish, Rashford and Martial.
Totally agree.
Rashford-Martial (Greenwood, Ighalo)
-------Grealish----- (James but he moves to RW)
Pogba------Bruno (McTominay)
----------Fred-------- (Matic)
would be a fine plan B no Sancho lineup for next year. As much as people on here are scared to have Fred in a holding role, we conceded 1 less goal than City this year and only 9 more than Liverpool but were 22 and 24 behind them in scoring, and Bruno in for Lingard/Pereira will cut some of that but not all.
And while no RW again is scary, Greenwood as a wide striker out there would probably bang a fair few goals in with Wan-Bissaka behind him as defensive cover and Pogba, Grealish, Bruno and Fred hitting him with passes, he wouldn't be as good as Martial or James overall but he really could score a huge number of goals in this setup.
I think in general, and i'm guilty of this too when I suggest signings like Dwight McNeil or Buendia to fill important holes in the squad (LWB/RW and backup to Bruno respectively), people here are way too worried about fit and not enough about having quality players in their prime.
If we can't get Sancho and there's no obvious class RW, I'd be excited with getting Grealish (or Maddison or Havertz or another 10) and spending the money on keeping Pogba and maybe adding a CB, we can can always try a cheaper option or loan at LWB and let James and Greenwood fight it out at RW.
We don't have a manager like Klopp or Pep to play a system better than anyone else knows and so need to find players who fit. We're more like an Allegri style team where the goal is getting quality players in good shape and figuring it out from there. It's probably not optimal but we have more money than sense and that ain't changing soon.