I don't doubt the Red Sox are good. In fact, they were the team I picked to face the Rockies.
But, I still don't understand your flawed logic about when rest is good and when it is bad. Idle, meaningless talk. Ask just about any manager which is better; more rest or less. Any manager will tell you more. It's the clueless, after-game, "arm chair" managers who don't really understand this concept.
And, as far as momentum is concerned, no one has more right now than the Rockies.
Home field advantage and road trip toughness are about even. I see this series slightly in favor of the Red Sox. But, that may be the Red Sox's biggest draw back. If they take the Rockies for granted, they'll be hurting.
I won't predict anything until I see the first game. Nevertheless, I have EXTREME confidence in my Rockies overcoming enormous odds. They've "more than" proved that ability already.