All you say is true. I think his greatest impact is relatively short runs and that's where his first steps seem to have power. He has run too much to avoid injury indefinitely.Allen is not faster than Luck was - Luck ran an impressive 4.67 at the 2012 combine (4th fastest - RGIII/Wilson/Jefferson) while Allen ran 4.75 at his combine - the same as Big Ben. Size wise they're all about the same - Luck (6-4/235) Big Ben (6-5/241) & Allen (6-5/237). Don't know who's stronger since QBs don't participate in the BP at the combine & there's no other method to measure who's "stronger."
The knock against Allen is he's running the ball too much and risking injury. He put up dual-threat type rushing stats last year rushing 122 times for 763 yds - second behind dual-threat QBs Hurts (784 yds) & LJ (767 yds - though missed 5 games due to injury).
Allen was not a dual-threat QB in college (Wyoming) while Hurts & LJ ran the ball almost as much as they threw it in college - so it's instinctive to them & a hard habit to break in the NFL. Allen has already rushed 422 times in just 4 yrs since starting as a rookie. He may be a bigger QB in the league with decent speed but he's no match for some of these skull crushing LBs who are weighing in over 230 lbs & running mind-blowing 4.4's. Look at LJ - he's starting to accumulate injuries & I think it's a matter of time before the big one hits him. I'd hate to see Allen suffer a season-ending injury trying to take head on some of these stud backers & safeties (I think he's already had a concussion or two?).