I don't think their is much crossing between Fury and Sens fans. Fury fans are similar to TFC or domestic soccer fans across Canada. They are progressive, diverse, craft beer drinking hipsters.  Sens fans, like hockey fans across Canada tend to be more conservative, predominantly white, more insolar "salt of the earth" types. Its about as wide of a gulf as any sports fans in this country.

If Ottawa can't sell out an elimination game in the Conference Finals, the last thing Ottawans can blame is scheduling conflict. 

Its a city of over a million people, nearly twice the size of Winnipeg who sells out the Blue Bombers and the Jets regularly, so I don't think its fair to expect the schedules to perfectly align.

Toronto is a bigger city, but the face far more constraints than Ottawa. Traffic in Toronto is worst than Kanata. TFC’s season crosses the Jays, Raptors, Leafs,  Argos and now English League One rugby. Despite all this they manage to sell 30,000 seats almost every game.