On Villa, no way I would pass on him, Bastos would be decent option, but signing him or passing on him wouldnt matter so much, if push comes to shove prolly pass mainly for age.
bastos is by no means a better choice to asamoah at lwb, at least not by much and not enough to warrant spending time and resources on.
tbh i don't care if a lwb can score or not, that is not we should be looking at, its weather he has the right balance of attack and defence to his play, bastos doesn't have that.