Scenario 2 is a poor analysis. He's blaming Sanchez for not throwing to Kerley who is breaking open with the Safety headed towards Gates, but if you notice Sanchez is already in his throwing motion to Gates, which is why the S is headed away from Kerley and the CB on Kerley is breaking off.
As far as Sanchez not throwing receivers open, I agree he's not. But his receivers have been letting him down running poor routes, wrong routes, etc. It's hard to expect Sanchez to throw a blind ball to these guys given that any mistake by the receiver in the scanario given would result in a pick 6. Sanchez's biggest issue has been throwing the pick 6 and he would be the one taking the blame no matter what if it happened, so it's understandable that he's gun-shy to do so. Doesn't make it acceptable, just understandable.