speed is such a factor in the playoffs. when the checking tightens up to such an insane degree you can't rely on great positioning anymore, you need to create separation on your own. That's why Willy is our best playoff forward. That's why third and fourth line plugs with jump suddenly become gamebreakers (Kapanen). That's why guys like Phil Kessel can lead a Penguins team with Crosby and Malkin on the roster in playoff scoring.
You can also see the space that speed makes for teammates to succeed. Leon Draisaitl, the best goal scorer in the league this year, can disappear on the ice because the defence are completely frazzled by McDavid's speed. It wears teams down like Florida's forecheck. By the end of the series Dallas defenders were spinning on the spot. They looked shell shocked.
I've been praying we would add some speed to this lineup for ages. Probably the slowest team in the league, especially down the middle.