The Titans game proved to me that this is the best version of Drew Brees we've ever seen

The video below gives you some more evidence.

This is what's been missing since we traded Graham: A true receiving TE who can run a vert down the seam and let Brees put it on him. We tried it with Arnold and Watson and Fleener. But Cook is it. He allows us to run all verts if we want and allow Brees to manipulate the coverage with his eyes and find his best matchup. It's impossible to stop if executed properly, and Brees is doing just that.

So, you add Brees' mental growth over the past 8-10 years to finally having all the weapons he needs and I think you're onto something.