Possibly, but still premature based on his performance last year. And if you are 30 and were never more than an AAAA player to begin with the floor is still worse.
A slipped-through-the cracks prospect or dumpster-dive who's still 27 or 28, I'm all for (that would more or less describe Clemens and Darrick Hall and even younger/more promising Cristian Pache. And those are the guys who Dahl would be taking a roster spot from even if he did get some of Castellanos's playing time).
Also let's face it we are burying the lead here. Whit Merrifield is still the real dead weight and physically aged guy on the 26-man. If he was the guy the front office acted like he could be - which none of us believed - he could be playing RF (or LF with Marsh in RF) once or twice a week.