You're right, because 75% of the running backs who reach the NFL level possess the skill set that you describe, which is why it's so easy for the average fan to "evaluate running backs." We saw a similar skill set from JJ Arrington when he came to the Cards. When the wins and losses counted, he turned out to be a wasted pick.
I dont know how many time I have to tell you before you comprehend the fact that competition plays a large role in how a running back performs. You can be good at changing direction and have great vision, but if you are going against a defense that is using their entire playbook and have faster playmakers, the ability to change direction and see the field is altered. In addition to which, your sample size is wayyyyyyyyy to small to make any determination that he is better than running back "X" or running back "Y."
Furthermore, you're trying to tell me that these superior qualities, which once again have been displayed for one quarter of preseason football, are easily determined based on a couple of plays; and is enough evidence for you to come to the conclusion that he is a better running back than Beanie. Please enlighten me as to how he has performed in the regular season when the Ws and Ls count. That's what matters.
It's obvious you are eager to get Wells off the roster. Fair enough. But to discount his performance this entire preseason all while heralding Williams as the 2nd coming of Walter Payton, with one quarter of preseason football as the backbone of your argument, is absurd. Lest we forget that Beanie had a good rookie season as the #2 back in a pass-happy offense in 2009. 800 yards, 4.6 ypc, and 7 TDs. And had he not underwent knee surgery last season and subsequently dealt with infections in that same knee, he may have capitalized off those numbers. To add, we were behind early in almost every single game last season and were forced to abolish the run entirely.
Beanie is running hard right now and has been pretty consistent getting positive yardage. Urban, Somers, and Jurecki echo my sentiments. At the moment, he is showing no signs of regression and I'm confident he'll give us a steady running game this season. It sucks that Williams cannot play this year as I think he would have been a fine compliment to Beanie, but even if he were healthy, Wells would still be the more talented and experienced running back of the two.