Can he handle the bullpen? Because that's Matt's greatest flaw right now.
Dunno, but on the 20th anniversary, I read an anecdote wherein he called a mound conference and told the battery he was calling the pitches for the next hitter. He'd signal to the catcher before each pitch. Got the guy out. Apparently the guy who told that story (the second basemen) ended up on another team, struck out years later, and had Cal lean in as he jogged in and whisper "Guess who called that sequence?" If I'm going to have a legendary infielder with not much experience, I want one who spent his whole career thinking.