Not trading Marner for that return

I would.

A trade like this would provide the team with better depth and balance overall.

I'm not sold on paying Hyman that much TBH. (He deserves it and will likely get it as a UFA).

I do like the team you have created here though. This is the kind of balance that is required.

That being said, I think it is highly unlikely that the team goes down that road.