Being the best team out of 32 in any given year is a difficult task. You need all areas of your team, forwards, defence and goalies working well.
This team is an experiment in whether a team can win with 4 elite front end pieces, and a complete dumpster fire at D and G. The experiment will continue for the foreseeable future.
Think about the teams that have won the Cup the past bunch of years...
Vegas - Theodore, Pietro, etc
Avs - Makar, Toews, etc
Tampa - Hedman, Serg, Vasi
Blues - Pietro, Binnington, etc
Caps - Carlson, Holtby, etc
Pens - Letang, etc
Hawks - Keith, Seabrook, etc
Kings - Doughty, Quick, etc
Incredible the Leafs aren't seeing this pattern. Like I said, this is an experiment. An experiment in futility.