First, speculation wise I think it's Mullin who made the promise to Frye and not Isiah.

Channing Frye to Golden State
http://nbadraft.net/draftbuzz041.asp
A couple weeks back, NBADraft.net received a tip that Channing Frye had a promise in the top 10. The likely team has recently been identified as Golden State. And while Frye would be a bit of a reach at 9, he's a bigman with touch and the size to play center.

There are obviously players with more upside that will be available at 9, but Golden State wants to continue on their upward swing as soon as possible (ie playoffs). Frye should be able to contribute as much right away as any big man in the draft not named Andrew Bogut. And with just Adonal Foyle in the middle, the Warriors are desperate for a center.

Second, it's not a surprise to me that the two best defensive teams going into the season are in the finals. Defense wins championships, period. http://www.knickerblogger.net/stats/d_de.htm

That said, it would be a mistake to pass on Petro, who I believe is the best defensive center in the draft.http://draftcity.com/viewprofile.php?p=45#