Andrew Luck is a throwback QB. Tough as nails but not cerebral, at all. It's obvious he hasn't had good coaching, at least in terms of being an efficient QB. I don't think he'll ever be as great as we're all hoping. 5 years into his career, he's still staring down receivers, doesn't have a grasp of what defenses are trying to do to him, and is still incapable of taking total ownership of the offense and the team. At a certain point, as an elite QB, you should have control of how the offense practices and be cleaning up any poor execution and timing from receivers through individual reps.
Now maybe the coaches haven't given him that much command yet, but for someone who is being paid as the franchise, I expect Luck to be a perfectionist and take over, once he's mastered the scheme. He has some of the worst progression reads in the league, not exaggerating. It's easy to blame the OC, but people forget that he worked with a rookie Cam Newton and did some quality work there. Their offense never looked as stubbornly vertical as ours does (with 3 different OC in a 5 year span) The reason for that is because it's not the OC that are forcing things, it's Luck. Arians takes a major blame for that, as I feel his QB coaching in Luck's rookie season was very influential to the player he is today.
Bottomline, the only way Luck lives up to his potential is if he's paired with someone who can rebuild him as a QB, similar to how Todd Hailey did Big Ben. Ben wasn't a fan of it at first, but only NOW is he universally regarded as an elite QB. Before Hailey, he was always considered a good QB playing with a dominant defense, that had a nak for making big plays in big moments (much like Eli)
Luck needs a real teacher, not another enabler