The Rangers don't have any legitimate defense prospects, so them trading Del Zotto or Girardi would be a nightmare for them. They are already down Sauer and quite possibly Staal
Because GMs also don't know how to think probabalistically. Josh Bailey probably represents the 50th percentile or so of 9th overall picks. Here, I'll extend a band between 7 and 11, and go over the drafts since 1998 to 2009:
1998: Malhotra, M. Bell, Rupp, Antropov, Heerema (1 out of 5 became a 'top 6 forward' - Bell was very briefly, maybe)
1999: Beech, Pyatt, Lundmark, Mezei, Saprykin (0 of 5 became a top 6 F/top 4 D)
2000: Jonsson, Alexeev, Krahn, Yakubov, Vorobiev (0 of 5)
2001: Komisarek, Leclaire, Ruutu, Blackburn, Sjostrom (I'll be generous and call this 3 of 5)
2002: Lupul, Bouchard, Taticek, Nystrom, Ballard (Again, generous, 3 of 5)
2003: Suter, Coburn, Phaneuf, Kostitsyn, Carter (5 of 5, again, being generous)
2004: Olesz, Picard, Smid, Valabik, Tukonen (1 of 5, generous)
2005: Skille, Setoguchi, Lee, Bourdon, Kopitar (2 of 5, generous)
2006: Okposo, Mueller, Sheppard, Frolik, Bernier (jury's out on Bernier, I'm calling this 1.5 out of 5)
2007: Voracek, Hamill, Couture, Ellerby, Sutter (2 of 5)
2008: Wilson, Boedker, Bailey, Hodgson, Beach (Generously giving 3.5)
2009: Kadri, Glennie, Cowen, Paajarvi, Ellis (2.5 out of 5)
So that's 24.5 out of 60 players who became top 4 D or top 6 Fs, and I pretty much gave everyone who was marginal a pass. This draft is supposed to be stronger, but again, you really can't go overrating a pick this high, it is by no means a sure thing, and if the Devils come out of it with a 2nd/3rd line player, it's not a disappointment, nor is it a triumph.