Volgin actully cracked the wall by electrifying the bullets in his fist's not with his actual strength.

Also all of you people are saying that Volgin has his electricity, you clearly are forgetting Tifa has her Limit breaks, level 7 Tifa can take on Emerald weapon and win...

Im not saying that she could take on Volgin in the same fasion but when you compare Volgin to Tifa you might want to take these factors into consideration.

And in closeing I have this to say, yes, Tifa did loose to Loz but your forgeting the fact that he had to move at lightning fast speed to win, had he not of had that ability the fight would have ended with him staying down on the floor after Tifa threw him there. Volgin cant move at lightning fast speeds and therfor would loose.