Regarding Chavis, the way I see it, the move would be only justified in order to help Dalbec to regain his form out of the spotlight. I'm Dalbec fan but he looks lost right now.
In the worst case scenario, Chavis will perform as bad as Dalbec but at the same time Dalbec might regain his form and clear his head in 2-3 weeks and be ready again.
Said that, Dalbec has way better upside than Chavis, that's out of question. Sending him to minors could help him to retake forces and achieve quicker that expected ceiling.