before he did his heist.....but is it before he got stabbed several times??
It's hard to say, Lee Murray never really fought at the level Bisping has.
He does however have one noteable fight against Anderson Silva which he lost but gave a good account of himself in which is pretty impressive (and a submission win over current Bisping opponent Rivera), still he did lose though and who knows it could have been an off day for silva, this is cage rage silva not the beast he has grown into today also.
Bisping has also given good accounts of himself against Evans and Wanderlei.
I suppose no one knows just how good Murray was (or could have been) so you have to back Bisping, but its basically impossible to answer and will just be gut instinct or opinion dictating.