Can anyone stay healthy at 170?

Apparently the answer to the question is no. Diego Sanchez is withdrawing from his fight against Thiago Alves at UFC 90. Josh Koscheck is going to step in for Sanchez but that leaves Yoshiyuki Yoshida with out an opponent for the second time.

UFC 90 is the UFC's first show in Chicago. You would think that appearing in the third largest market in the U.S. would constitute a stacked fight card, but it doesn't appear so. With two weeks before the show this is the card,

MAIN CARD (TELEVISED)
Middleweight champ Anderson Silva vs. Patrick Cote
Thiago Alves vs. Josh Koscheck
Fabricio Werdum vs. Junior dos Santos
Tyson Griffin vs. Sean Sherk
Rich Clementi vs. Gray Maynard

PRELIMINARY CARD (UN-TELEVISED)
Thales Leites vs. Drew McFedries
Spencer Fisher vs. Shannon Gugerty
Matt Horwich vs. Dan Miller
Marcus Aurelio vs. Hermes Franca
Josh Burkman vs. Pete Sell

There are a lot of lightweights which should make for some really exciting fights but the card doesn't carry the gravitas of any big names beside Anderson and Koscheck.