I can't find that Tim Grgurich article. I even ran just Grgurich in the search box on your site. I got a couple of hits. But nothing about kg
 

I already posted it in the comments on your site.
 

Here you go... It was on the Examiner.

Here is the quote Yesterday, our game had O.J. Mayo, Chauncey Billups, Chris Paul, Sebastian Telfair, and Tyronn Lue. We had five point guards playing the five-on-five, with four teams, so one guy had to move to two-guard. It’s amazing for O.J. Mayo to play against Chris Paul, Billups, and Telfair, who’s fast. Rudy Gay gets to play against Tayshaun Prince and Kevin Garnett.

And here is the link

http://www.examiner.com/x-10630-Boston-Celtics-Examiner~y2009m8d31-Exclusive-interview-with-Kevin-Garnetts-summer-trainer-Joe-Abunassar

I may be reading into it, but I think that is saying that KG was there and playing in the 5 on 5 scrimmages
 

Well, it sounds like a fair interpretation. Thanks, FCF!