Well, Jason did the Paul sessions with James Gadson on drums. Cool, eh?
I will tell you one thing about those session, Jason has fucking balls. Not only did he give Paul copies of his Bedtime With the Beatles CDs, he sat there and listened to them with Paul. Mac sent him a letter telling him how much he enjoys the records, even.
And yes, I agree. If there were any justice, Jason would get at least as much if not more recognition than John Mayer, Let alone Jon Brion. I think that while Jon is a better multi-instrumentalist, Jason is a far better songwriter and producer (and he doesn't take five years to make a record).