"A lot of it is from the mental standpoint," Whalen said. "He's getting more and more comfortable recognizing defenses, making adjustments, getting us in the right looks. And also just getting more and more on time with certain timing throws and things like that."
For the first time as a professional, Luck isn't spending the offseason learning a new scheme. That familiarity also has its benefits.
Players are thinking less and acting more, a factor that should increase the speed at which the offense plays. But they're also learning concepts at a deeper level.
"I do think everybody's more comfortable with the plays," Luck said, "and the dialogue is different just in terms of really getting to the nuts and bolts of the plays."
Luck also has more weapons at his disposal.
The addition of Hakeem Nicks in free agency gives Indianapolis three players with at least one 1,000-yard receiving season. Wide receiver Reggie Wayne, tight end Dwayne Allen and running backs Ahmad Bradshaw and Vick Ballard are returning from injury. And some suspect third-round receiver Donte Moncrief could be one of the steals of the draft.
Add in the forward steps taken by Whalen, Da'Rick Rogers and LaVon Brazill late last season, and it's easy to see why expectations are high for this attack.
Luck, of course, remains at the heart of it all.
"Andrew, he's like the commander-in-chief out there," Brazill said. "He's handling everything, making sure everybody's lined up straight and everything. It feels good to be on the same offense."
Those looking for a seismic shift in offensive philosophy this fall are likely to be disappointed.
The Colts are going to stick to the same basic tenants that allowed them to withstand the loss of five signficant contributors and win an AFC South championship a year ago.
"I don't think the mentality necessarily changes," Luck said. "We're still going to want to run the ball. We're still going to want to score points, be effective in the throwing game. So I don't think that'll ever change, really."