You have video of the bold? I'd like to see him warping back. I'm not saying madden hasn't had its set of warping/sliding issues. I think you crying "the sky is falling" on this one.
Now about the corners leaving man coverage to blitz, I've never noticed but will check tonight. I believe they might sit at the line of scrimmage a second reading the run before their awareness switches back to pass coverage but I doubt they are switched to a blitz assignment. I'll double check though.