Wisneiwski is a definite upgrade from Wells.
I would like to think that the Rams have pretty much evaluated all of the rookie Centers and Guards and have an idea what will be available to them in the draft. They were right on with the Eval of Martin. So, maybe they set their price on Wiz and don't want to budge because they know they can probably get a good Center in the draft.
BUT, then I remember how they botched the ORG spot last season and they had to rely on an over the hill Guard all season. I know that the plan was for the lineup to be Barksdale, Saffold, Wells, Robinson, Long, but Joseph was a horrible backup plan and he was supposedly the best thing they had in the wings? Really? This team seriously needs to upgrade its backup OLine options. I know Martz says it is the toughest position to fill but other teams usually have at least one good Oliner on standby.