TBH, there's no real difference between the quality of these teams. They split the regular season, they have an absurd streak of one goal games in the playoffs, they have these veterans who've played years against each other. I think it'd be fluky if one team won 4 in a row when they are that even. Caps win Friday and all the first 4 games will have done is make it a 2 out of 3 with Caps home ice.
Also, I may be an idiot, and I love the guy, but Tuuka has looked vulnerable and wooden in stretches (awesome in others). The pick ups of Reilly and Hall were / turned out huge.