The problem is that you are using stats as the basis for your 'facts' when the two QBs are in completely different situations.
Simpler offense and better running game means higher completion percentage and higher td-int ratio.
Luck also averages over 40 passes per game. For most QBs, including guys like Brady and Rodgers, their stats taken from the 30+ pass attempts in a game are significantly worse than during pass attempt 1 to 30. Luck and RG both follow this trend, except Griffin has hardly had to do it and Luck goes well past it every week.
I am not saying that you are wrong in RG being rookie OROTY (and I am not saying you are right), however, there is quite a lot of subjectivity in the voting and the fact is that Luck is operating an NFL offense at a higher level in terms of complexity, responsibility and performance than pretty much any rookie has before. That will carry a lot of weight with voters.