Bizarre deal for New Jersey. Glass is a defensive 4C, not sure why they're trading a 3rd and a decent prospect in Graham for that.
I don't think Stillman is anything of note, but one benefit with him is that he's not veteran status in the AHL going forward while Gruden is. The Penguins AHL team has a lot of vets right now (part of why they're really good) and they probably didn't want to waste a veteran spot on Gruden. Gruden is under contract for next year, so getting out of his deal allows them to replace him with a much better AHL vet.