Signed? Not many but superstars like Wilt, Kareem, Gasol and Howard have been forcing themselves to LA for years. I can only think of a few established superstars in their prime that have switched teams via FA over the last 20 years. Shaq in 96 (LAL), Grant Hill in 00 (ORL), Lebron and Bosh in 10 (MIA) and Howard in 13 (HOU). I'm sure I'm missing a couple though. Fair enough, I was only thinking through signings but forcing trades works too. I'm not sure the same argument can be made with the Knicks, though.