I need to see more of Kennedy and I'm really looking forward to his start on Friday. I missed the entire game on Saturday (at the US Open), but from what I saw on the Encore, there is definitely promise.
From what I saw in his debut, and from everything I've read on him, it sounds like he does not throw exceptionally hard and relies heavily on his location. Like most pitchers, if his location isn't sharp, he is going to get hit (see second inning Saturday). On top of that, whether his location is sharp or not, he needs to get his offspeed stuff over, or it allows the opposing hitters to sit on his fastball, which is anything but overpowering.
He seems to have a common arsenal (fastball, curveball, slider, changeup). His offspeed stuff obviously needs work, but he seems further along with his changeup then someone like Hughes. That is a key factor for me, because I'm a big proponent of working off your fastball with a changeup. You can't argue with his minor league statistics, and his quick rise to the majors, so I'm very curious to see how he does the rest of this season, and how he progresses during spring training in 2008.
As for Sanchez, I'm not too familiar. I understand that he throws quite fast, but I also understand that he has a history of arm injuries. At this point, he's probably better suited to be a reliever, but I'm not going to make any predictions until I see how well he recovers from his arm injury.