Honestly, watching Burke in AAA he started the year off very rusty. There was a very noticeable improvement in his command. He's likely always going to have above average walk rates, but his last 4-5 starts in AAA I don't think he had a single non-competitive AB where he just walked someone on 4/5 pitches. He has the stuff to make mistakes at the big league level, someone like Cannon had zero room for error, but Sean can just let a 98 MPH, 7+ extension, 18+ IVB rip over the plate and he's still going to get swings if its anywhere near the zone. That has some serious staying power when you have the stuff to widen your margin of error.