In my research for the season, I see that Kentucky also moved their all-everything second baseman JaVon Shelby to third base this season as well.
So, the two best 3rd basemen in the SEC may have been middle infielders before.
I think Senzel is a more natural fit at the hot corner than Shelby but it is apparent both Serrano and Henderson are trying to take some pressure off their stars defensively as the 3rd baseman on a team is usually more of an on-field coach as well- especially if something needs to be said to pitcher.
This will also help draft status as both guys could be seen as being able to play anywhere.