The midfield three was impressive, with them seemingly being entrusted to be flexible and rotate. If you’re playing that way, realistically you need 5 or 6 guys who can fit into that system, tweaking it from week to week according to the opposition, and to cater for fatigue and injuries etc. Hamer, Sheaf, Eccles, Palmer, O’Hare and Allen would be a formidable midfield squad. As previously said, possibly Sheaf, Hamer & O’Hare as first choice, but if they're all fit there's serious competition.
So in the ideal world where we get to keep all of those + Gyokeres next season, we mainly need to focus on bringing in a couple of top wingbacks and another pacey goalscoring striker. We would have a properly dangerous Championship side.
The defence is another question, but I’m assuming that putting together 3 decent centre backs is well within Robins’ ability. I’d like to think McNally and Doyle will be on the books next year, and if so we are nearly there.