Simple really, when he first arrived he was lightning quick and could make up any lost ground To cover his defensive frailties. Since he's made of the same tissue paper as Webster, he broke, and that, sadly is that.
He has always been a disco option, with an attacking bias, never would have got...
He was a proper Billy Whizz wasn't he. . . . Still quick enough to casue trouble.
Also has some versatility, didn't he get slung on at left back, and survived to tell the tale. . . Its a squad game now, and he's a very valid part of it.