Yah, Dietrich definitely looked more interesting before his 2nd half nosedive. But if not for his 2nd half nosedive, he wouldn't be available.
And unlike Yolmer, Dietrich can play the OF, has quite a bit of pop and can get on base. I am not proposing the guy as a solution to anything, but he's a decent fit as the 25/26th man type on a cheap 1 year deal. Could fill in at 2B until Madrigal is ready, move around thereafter.
Just another option.