Maybe that's not the case. (Taking Bill Muir's retirement advice.)
Adam Teicher has a story up at the KC Star after a recent interview with Chiefs head coach Romeo Crennel. The quote from Crennel: "I'm not ruling Kelly out. I think he would like to come back and play." Check out the rest of the quotes in the KC Star story but it certainly sounds like Gregg could be in play for the Chiefs this year.
Then again, it also sounded like he was going to retire just a couple months ago, so we'll have to wait a month or more to find out. Crennel tells Teicher they've kept their eye on some nose tackles on the open market but don't plan to make a move there until after the NFL draft next April.
So, yeah, that's potentially a pretty big piece of information. Nose tackle is really the only position on the Chiefs roster that is a major hole at the moment. That the Chiefs aren't making a decision until after the draft suggests nose tackle is a very real possibility.
Interesting stuff here.