Honestly. What is the rivalry thing? Crosby and Ovechkin do not even have a rivalry. I'm pretty sure both of them have no real personal feelings for one another at all.
Sid/Ovi is no different really than Yankees/Red Sox. The players have no animosity toward one another, it's the fans/press that hype it up. The last time the Yankees & Red Sox really hated each other and I mean really hated each other, when there was a full on bar-brawl going on (Pedro throwing Zimmer to the ground doesn't count), was the 1970s. Thurman Munson bodyslammed Carlton Fisk onto home plate, Bill Lee had his shoulder separated, someone punched Lou Piniella in the face -- it was brutal.
So this whole Crosby vs. Ovechkin thing is totally press manufactured for the sole purpose of driving up drama and starting s*** between Pens fans and Capitals fans. Nothing more, nothing less.
"People assume that time is a strict progression of cause to effect, but *actually* from a non-linear, non-subjective viewpoint - it's more like a big ball of wibbly wobbly... time-y wimey... stuff." -- The Doctor