Ryder was basically invisible on Wednesday. Even though that was his first game (no practice, no sleep, etc.), I think that we can safely assume that will be the case for most games. When Ryder isn't scoring, he's generally not helping the team.
I know that Ryder will put together some scoring streaks this year, but I still think Cole > Ryder if you want to have a team that is tough to play against.
This move seems to me to be more of a salary dump than anything, as it seems contrary to Therrien and Bergevin's idea of being tough to play against.
Ryder's gotta score some 10-12 goals in his ~28 games with the habs to make up for the stuff he doesn't bring that Cole does bring.