If your kid routinely gets failing grades, then surprises you with a report card with C's, you don't call him a loser. You brute.
Even your assessment is that it is matter of learning. I'm not sure what the deal is with Sherrod, but I hope his career is salvageable. If he has the mobility, he can be an NFL starter.
I watched San Fran play a backup tackle last night, the famous Jonathan Martin. Hard to watch. Probably backup tackles in the NFL are a sorry lot, it's a tough job for a big man.