This trade makes no sense for Detroit. Why would they trade for Markstrom when they already have Howard and Mrazek who are just as inconsistent and non-definitive #1 goalies as Markstrom? That leaves Detroit having to bury one of these goalies that carry at least $3.3M cap hit (Markstrom, Howard makes =$5.2+/year and Mrazek=$4/yr) in the AHL and since they all have to pass through waivers I'm assuming the Islanders would pick any of them as soon as they tried to pass through.

That leaves Larkin (promising top 6 center) for Gagner (playing 4th line minutes on a terrible team) and a 4th rounder.