Don't really think that's at all what he was saying. He's just saying that Burger isn't a bad 3B, or at least isn't terrible, and Vaughn is just flat terrible in either corner OF spot. He even said errors for OF aren't usually illustrative at all.
Burger is decent at 3B. It's a one step and fire position. Being slow in a straight line isn't important it's all about quickness, hands and arm. Jake isn't some elite 3B but he's passable.
Vaughn is not passable in the OF. He was there last year just as a way to get him on the field as an Eloy replacement. He did an OK job for a guy thrown to the wolves but it's obvious his speed severely limits him in the OF. He should be a 1B but we have the "I can't ever DH" guy over there I guess.
Yup, been wallowing in mediocrity too long. Team is hitting well enough now to start winning 7 of 10 and shit. Schedule is going to get a lot easier so let's hit the ground running by taking this series with Toronto.