They were a REBUILDING TEAM.
That is, the hot start probably surprised them as much as us, but before the season they were willing to try things like Hoskins in LF, knowing he'd eventually end up at 1B. I think some things happened due to circumstance, if Crawford is healthy and off to a good start with Hernandez, Kingery ends up back in AAA. If Altherr played well, etc. And if the team isn't in contention, they're sellers at the trade deadline.
Santana gave them a veteran bat to take pressure off the young hitters and provide an example of how to work an AB - which is less about getting SPs out of the game than an approach to hitting that avoids swinging at pitches out of tte K-zone, or with less than two strikes, pitches hitters can't handle.
Now if they don't learn from last season, and repeat the same mistakes, then there's cause for concern.