I don't get this theory, his knee is in bad shape (he's considering surgery immanently), and by all accounts he's a guy who would play with a bloody stump if you let him. You want him to make the decision?! Hmmm...
DA: "Well, KG, what would you like to do? Play in the postseason for a team that needs you to be a legit contender, or sit this one out?"
KG: "Just amputate, put me on a wooden peg, and get me out there!"
Sorry, I'd rather have a team of professionals make the call.