I hear everyone's opinion regarding holding him back 13 days in order to gain an extra year of control, and I don't necessarily disagree with that. However, if he ends up being anything close to as good as advertised, IMO, the Twins would be very foolish to not lock him up to a relatively long-term extension well before he gets very far into his arbitration years, buying out those arbitration years plus one or more free agency years to boot. The team has shown a propensity to do exactly such a thing for players with lesser current ability or future upside, at least from a fan's perspective (a contention better left for a different thread). So why not here?
While I personally believe it's a non-issue here, that doesn't mean I think a 13+ day stint in AAA won't happen. Quite the opposite, in fact.