Excellent timing.
Summary: depending on your outlook, Shelby's performance is either going to regress to his underwhelming peripherals or is underwhelming peripherals are going to catch up to his performance as his confidence increases in his new pitches.
As a biased homer I pick the latter, but if you take the former, then I won't hold it against you.
Someone essentially took our discussion of Miller and posted it as his analysis on fangraphs. Bastard.