Pretty sure the math checks out.
Fun fact. The 77% percentage is the same percentage I perceive that Mark Jankowski at UFA will still be a Calgary Flame. Unfortunate he didn't pan out for us... but oh well.
Is that by season's end, "What percentage chance will Mark Jankowski be a Calgary Flame?"
And your guess is 77% chance he will be? That sounds like pretty good chance he'll still be around.
And question #6.