I'm sorry, but, your Captain being nearly decapitated in the 1st game 1st period does quality as 'unlucky' ...they didnt finish out the series, and there is no excuse for that, but, you cant 'make' your own luck out of the Tavares situation.
If Kucherov got knocked out in game 1, period 1 TB doesnt win the Cup, and that is a certainty
Somtimes, 'luck' is your players not getting hurt, or you get a crossbar and in, rather than out, or Hyman's butt doesnt block an open net gimmie of a goal in the series clinching game. ...that is 'luck' also, but, for the other team.