Four thoughts
1) I realize Frank Nighbor is in your top tier anyway, but I just want to say that he absolutely needs to be the first player from that Ottawa dynasty to be inducted. He was seen as the real star of the dynasty and they fell apart defensively when he was out on bereavement leave. See his linked profile for more details.
He also won the first Hart trophy despite being past his scoring prime, and he was the first member of the Senators dynasty to be inducted in real life.
2) Check out Eddie Gerard's profile. It appears that contemporaries viewed him on the same level as Moose Johnson, just below Sprague Cleghorn, and a step above Harry Cameron and George Boucher.
3) Frank McGee probably should be in the second group of 10 (not sure who he'd replace though). There is something to be said for being the absolute best player in the world for several years - something nobody in your 2nd tier can really say. Sure, his career was short, but it wasn't THAT short for the era. Same thing for Harry Trihey, who is probably just a step below McGee. That "historical significance" thing which doesn't matter to the ATD, but does matter here.
4) You say Russel Bowie is the best offensive player on the list. I think Cy Denneny has a lot to say about that. Yet, I would induct Bowie before Denneny too because Denneny was, at best, the 2nd most important member of his team. That "historical significance" thing again. (Either way, we're just talking about the order here, they both will get inducted eventually obviously).