I have a feeling, whenever Martinez leaves Nebraska, we will find out he had some lingering leg injury that stemmed from his Freshman year injury. Something from that injury his Freshman year was always bothering him, because that is the only reason or explanation you can make for why he no longer just takes off and runs. The reason he had such a bright future his Freshman year was his ability to run the football and his play making ability to just take off and run when nothing was there. Since that injury he hasn't been the same. He now takes 10 seconds to make a decision, there are 5-10 yards wide open in front of him, but he doesn't just take off and run he continues to look for the the throw. The coaches don't really design anything around his ability to run the football, as it feels they are stubbornly trying to make him a pocket passer when clearly he isn't a good pocket passer.
We won't hear anything now as a way to protect him and not let other teams in on a potential major weakness as we do, or at least the announcers, still talk him up enough to be this elusive dual threat QB that you must always account for. Once teams realize he's got a bummed leg they may not be questioning what he might do.