Only two of those players will likely play at right back though, Walker will be a centre back and Trippier most likely left back if we go to a back four which provides more centre back cover as he did in the Euros.
The thing with Maddison though is that he has a lot of competition ahead of him. Southgate is a lot of things but he’s fair and also pragmatic. If you look at creators in the midfield that are less work horsey then you’ve got Foden, Grealish and Mount. Away from them we’ve also got Bellingham and Ward-Prowse who will play a slightly different role but still offer much of the same.
I feel for Maddison but I think there’s always a logic to what Southgate does and if a player who seems to deserve a call up doesn’t get it it’s not cos Southgate doesn’t rate them, it’s probably because he balances out the type of players he will call up and he’s already called up a few players similar to Maddison.