Three years seems excessive for a second choice full back. At max I'd give him two with a year in our favour.
I'd rather have Ebanks-Landell at RB. And if the likes of Aaron Simpson and Tendai Matinyadze aren't better than Doherty then they have no business being here.
He isn't going to improve his ability to run and turn, or acquire a first touch, even if he did ever learn where he's supposed to stand or stop slicing clearances horribly. As baffling a decision as signing Quashie/Bent on loan or the multiple contracts Darren Ferguson kept getting handed.
(hating on Doherty before Deutsch made it cool )