Considering both your post and the one you replied to, I think it's all about scheme and fit, just like with the team overall. Putting a line together is all about fit and chemistry, all those things.
Folk talk about how lucky we got with Brees' shoulder in the beginning. But the two most low-key bullseye draft picks during the Payton era were Jahri Evans and Carl Nicks. Those two guards let Brees step up in the pocket and deliver all those seam shots and deep shots we all remember. I'd tell people if Drew steps up cleanly, you can make a bet to yourself in that instant that the pass will be completed.