Stotts himself said it, he'd never seen someone make such a big leap over one off season.
Well I'll tell you how that happens, through hard dam work, and Will Barton has already returned to PDX (as of 3 days ago actually) and commenced his off season training.
(I don't know how to link twitter)
"Back in pdx. Feel like I can be the best so it's time to put that major work in. So ambitious all or nothing. Let's get it!"
This is the kind of guy you want on your team!