Dude. Homer much? Go read the NFL.com scouting reports and read the measureable comparisons on Collins and Martin. Collins criticisms by scouts are the same as are found in this thread. I am not saying he won't be good or great or start week one or even make the all-pro team his rookie year.
But I am saying we shouldn't count on it. Leary is darn good. Collins is a rookie. Normally 1st round lineman are drafted to replace weak starters. Leary is not a weak starter.
His weaknesses from NFL.com as you mentioned:
WEAKNESSES
Lacks ideal length to stay outside in the pros -- relatively small wingspan. Not a pure road grader who rolls off flat-backed and buries defenders. Could be stressed by bigger, more powerful defensive tackles. Can improve balance and sustain on the second level. Does not have experience at guard. Could stand to bulk up in preparation for a move inside.
http://www.nfl.com/draft/2012/profiles/zack-martin?id=2543480
Oh, wait... that is Zack Martin.
The point is, Martin had some "weaknesses" as he was heading into training camp too. They all do.
Footage of Martin messing up at Notre Dame is out there. But he had terrific tools for the coaches to work with and a natural talent that says he should have been taken in the top half of round 1.
Similarly, Collins has terrific tools and a natural talent that says he should have been taken in the top half of round 1. I'm not talking about you necessarily... but I'm not sure people really know how physically dominating and how talented Collins really is. The guy is a monster.
Having said all of that, I don't necessarily disagree with you that Collins might not beat out Leary from game 1. Leary is a good player and is much better than Bernadeau, who was Martin's main competition. I could see it taking a while for Collins to win the job. However, I certainly wouldn't be surprised if Collins did win the job outright in camp because he is a super talented OL who only has a few flaws in his game, much like Martin did. Hand placement and not being too aggressive are the biggest two that he needs to work on IMO and that is fairly easily corrected by coaches.
Zack wasn't a perfect prospect, although he had terrific tools to work with. Collins isn't a perfect prospect, but he has terrific tools to work with.
Collins almost certainly won't be as accomplished as Martin was in year 1... but he can be a day 1 starter. I think having the super intelligent Frederick next to Martin really helped ease Martin into the NFL, and he will do the same thing for Collins. Tyron on one side and Frederick on the other really helped Leary and it will likewise help Collins.
Just my two cents.