I like this move. I believe there are three options in Nashville that are better suited for the big league club than Hiura: Turang, Mathias, & Brosseau.
Turang as a LH bat would also be an upgrade over Peterson. Mathias & Brosseau are likely better RH options off the bench than Hiura. All three have greater positional flexibility.
This Hiura demotion makes sense to me … assuming Renfroe becomes an option at 1B should Rowdy need a day off.
I know everyone (including me) loves the clubhouse influence of Suter, but he would be another that might benefit from time in AAA to work out his early season struggles.