I have a feeling it is due to his high motor trait and pursuit rating allowing this to happen. In real life he never stops as you often see him coming out of nowhere to make the tackle 20-30 yards downfield. So in the game considering he has a 97 pursuit rating and the high motor trait which I figure has something to do with being caught from behind this year.
As for the running parallel to the line of scrimmage thing I support that decision 100% as I've actually seen people scrambling in a realistic fashion instead of just heading toward the sidelines then turning up. Saying Vick isn't a play-maker anymore is crazy as I've watched him break off 50 yard runs when it is there but if you just look to scramble this year then you aren't going to have as much success as last year or previous years.
I just finished a game where I had 190 yards with Ryan Grant with 2 40+ runs (one in a shotgun off tackle play, other straight dive out of I-form strong) so if you get in space you can get separation even with guys that aren't 95+ speed.