I too don't get the notion that if we don't put some distance in the standings before Mussina and Wang get back (next week, btw), that they'll run away with it. While their top-3 will be good pitchers, all three of them live and die to some extent on the ball in play. Those guys can give you good outings, but because of that dependence, they aren't stoppers. Right now it looks like we'll have at least two. With 2 stoppers, losing streaks just don't happen.
Maybe none of that happens. Maybe Schilling goes old-fart, Wakefield has 5.00+ era stretch, Beckett ditches all the progress he's made, and Matsuzaka turns Nomo, but we haven't seen signs of any of that happening yet. Until it does, there's just no way you can predict a runaway without it being wishcasting.