Has he not read that "Your position on this list does not alter your obligation" (or something to that effect, stated clearly on icrew). Pretty balsey to risk being out of position these days with the interest the company is putting on this (not to mention ALPA's related cautions).
If one can't report 12 hours after being contacted while on long call, I'd think they are risking their employment with Delta. They are arguably and selfishly (in my own opinion) also weakening our negotiation position about all things reserve. Reserve has gotten pretty good compared to some alternatives... let's not screw it up. Sitting DTW reserve from Florida as a newbie sounds pretty dumb to me.