This is one of my faves.
As for developing his drumming throughout the years,,,,,I dont know. He's Ringo. He did use some double bass on Choose Love I guess, but I dont feel Ringo was or is out there trying to reinvent himself. He has his style and kind of sticks to it.
I would say Ringo probably did his best stuff in the Beatles just as Paul did bass wise. I'm not done with this thread though. You have given me reason to go and revisit Ringos catalog.