If Winnipeg loses, they are the crossover. They have 1 less win than Calgary or BC. The only way Calgary would crossover is if Calgary winds up third team in a 3 way tie (BC loss + Calgary loss + Winnipeg win).If BC, Winnipeg, and Calgary all lose, Stamps crossover. Montreal appears to hold the tiebreaker over Hamilton if Hamilton loses to Ottawa.
Hamilton has tiebreaker over Montreal. They beat them twice. If Hamilton wins, Hamilton hosts the Eastern final. If Hamilton and Montreal both lose, they also host the Eastern final.