I asked Lakers G.M. Mitch Kupchak why Phil Jackson was critical of the team after they hired Mike D'Antoni. "I got the impression, looking back on it, that [Jackson] thought the job was his until Monday, and that he had [more time] to decide," Kupchak said. "That wasn't our understanding, but I see how he could feel that." ... NFL Network's Kurt Warner thinks Tom Brady and Peyton Manning are system QBs—and there's nothing wrong with that. "We're all system quarterbacks," Warner told me. "That's why it's so difficult for guys to go from one place to another and have success. I'll point to my transition from St. Louis to the Giants. The system in New York didn't fit what I did." ... Fox analyst Charles Davis thinks the NFL won't be able to assess USC quarterback Matt Barkley until the combine. "The tape measure will be very interesting for Matt [who is listed at 6'2"]," Davis said. "The shorter you are, the more athletic you have to be." ... NASCAR Sprint Cup champ Brad Keselowski doesn't apologize for tweeting during race stoppages: "Being in a red flag is like being in a grocery-store parking lot."