Full backs play well we play well, full backs incredibly important in stendell system which starts off as 442 but isn't really it's a 343 or whatever it's hard to follow as Potts plays wide, central or forward.
The consensus here http://kerrydalestreet.co.uk/topic/11089494/1/ seems to be that he's unlucky to be up against a lot of better wide players Celtic have but that he could be a good addition to the right club.