I wouldn't say it's impossible for Bamford to return, after all, he's been floating around into nothingness for god knows how long now. They have Jordan Rhodes, David Nugent and Christian Stuani, none of which I would be confident to fire in the PL on a consistent basis. Adomah is probably their best attacker for me, but I think key for Boro will be trying to tie down players like Gaston Ramirez to a permanent deal.