No, it wouldn't. I just gave you a CLEAR example of where the listed time on some sites were way too slow. If you run a 4.8, as one had Dobbs listed, you ain't outrunning any defensive players except the DT's.
He was/is clearly faster than that. Plus, he mentioned in one interview that he was timed at 4.6 in HS, and his HUDL profile had him listed as that. But that's not going to stop critics like yourself from chosing the slowest one to use to bolster your argument.
Kendall Wright was thought to be a speedster at WR, coming from Baylor and RGIII's favorite target. He surprised everyone with a high 4.6 time at the combine. Both runs.
His draft stock fell considerably, but he was able to refine his TECHNIQUE by the time his Pro Day came around. He was able to improve upon it and get into the high 4.4's. So, based on technique for running the 40, one's time can fluctuate from one day to the next.
Bama's Heisman RB, Ingram had a similar situation happen with him. Ran a really slow 40 at the combine, and turned most teams off. But he got it back down to a respectable level at his Pro Day.
So, again...knowing these reported times are all over the place, you keep using them to bolster Gurley's estimated speed, but use Lewis' to bash him and try to make him sound slow.