I will prognosticate that Sale will not be the deciding factor in today's game, unless he completely blows it giving up 5 in a couple innings. The Red Sox bullpen will be called on for 5 or 6 innings and will need a top performance. The hitters will need to review the tapes of games 2 and 3 to remind themselves how situational hitting and plate discipline will be effective.
There is no momentum in baseball because each pitch and AB is an independent event. What does is exist is preparation and confidence that a hitter can react well to hittable pitches, not chasing high FB's and low breaking trash. I think Bogey's 1st inning HR told the guys they had another easy night coming and they lost all incentive to work Houston pitching.
Oh yeah, and 2 Grannies won't hurt. the cause. So don't sweat the good Sale or bad Sale. He could blow it up, but he can't win it alone.