There's a 12/13th forward spot with his name on it if he can beat out some young guys pushing for spots. Ottawa has very few players they need to risk on waivers, so they aren't going to be afraid to sign someone. Could easily be Ennis if he plays his cards right.
I'm actually a bit shocked guys like Rieder, Chaisson, Neal, Jankowski, Gusev, Vesey, etc.. aren't looking at Ottawa to try and capture a spot. There's a big fat 3rd line RW position open for someone to steal. Then again, looking at those uys and maybe Ennis is the best of the bunch, LOL.
Edit: I just realized Neal has played in the playoffs for 11 straight years on 5 teams, crazy.