Watson played RB on the rare occasions he was fit. Predominantly played CB for Hartlepool on loan though, and seemingly done well.
Dont think his quality is in doubt, its entirely injuries that he's at this level.
Games I remember him were against Celtic, where he played RB behind Foster to double up on Tierney and Sinclair, and he looked quality. Last game he played was at home to Partick, and Miles Storey destroyed him. Maybe just unfit but he was so slow it was unreal.