Regin remains in the lineup for the same reason the Isles signed him. He's here to fill a specific role Garth sees. Regin is our 2013 Keith Aucoin. Despite not producing much, Aucoin remained in our lineup all year long. I doubt you'll see Regin sat much for that same reason. It's a philosophy understand but don't necessarily agree with.
There is absolutely NOTHING positive for Nelson to take out of this experience thus far. Regin will very likely not be here next year and he certainly doesn't have a large enough impact to merit keeping in the lineup over a valued rookie like Nelson. We can NOT afford to block the developmental pipeline for the sake of temporary role players.
- keaner17

Agree completely. Also, Regin's put up 0s in every game but one, playing in all games so far this season, has recorded zero shots on goal in three games and one shot in two others, and is -3 (I know...useless stat). I'm really not seeing what he brings to the table. I guess he's sort of OK on faceoffs, but even there he's third among four centers, behind Cizikas and Nielsen. He's not a physical player. Maybe one of the "advanced stats" disciples can paint a rosier picture of what he does out there, but I don't really get it. Maybe it's just early and it'll take some time for him to hit his stride and show us what he's got...or something.