Stevens has had hot starts in the past. He usually goes well for a couple of months and then levels off. Casey is the better player and his start is more impressive without Griffey around him in the lineup. Teams may start pitching around Casey some more. Of course they could falter.
Any team can.
I think their starting pitching is vastly underrated but many of them have a history of injuries. So, it's a long season. I like the Red Sox a lot but don't get too overconfident. The biggest thing is that they just stay close in the race until they get Garciaparra back. Teams want a player with a consistent history of production so that the odds are better of getting a good return on the investment.