yeah, berdych is the more complete player. and all though gasquet can be pretty quick defensively, i'll agree that berdych is the better mover. his movement and footwork when aggressive are very good, very precise, and is impressive for a big man.
it's hard to say who has or had more potential however. i also think there are different kinds of potential relative to tennis and it depends on how one perceives potential. i think berdych has more potential to have better results. but as an athlete, one can argue berdych has less potential now since he's already a complete, well developed player. and one can see gasquet making strides to reach his potential and could argue that he has yet to reach it since he still has flaws in his improving game, giving him more room for improvement and more potential.