He's basically a slight upgrade from Fitzgerald. Team needed some defensive depth and a little sandpaper. In those last two games they won they got tossed around pretty badly (Dahlin is probably still in an ice bath). Tampa is going full thug-mode now with Paul/Cernak/Jeanott.
I'm guessing some in the lower bowl will chose the upper decks simply to get out of the elements. If you want to sit close to the action, you have to contend with the rain/sleet/snow.
He can dress as a backup and it will count towards his ELC. After the trade deadline (Mar 3rd) there is no roster limit as long as they remain under the cap and they have tons of cap space so that's not an issue.
I agree with others that if they are in a playoff chase you won't see him. I know many are already done with Comrie, but I don't think Adams is.
When you play 11 games in 20 days (before the all-star break) you can make an argument for carrying 3 goalies (well maybe). When you play 4 games in 20 days and we're still carrying 3 goalies, not so much. They look rusty, all 3 of them.