Joe has never been one to give a flying fuck about much, so why would he care if the guitar he likes is someone else's signature model? Betcha it got put in his hands and he said "I like how it plays, I'll take it." To him it's just a great playing explorer.
Here's a good question...take your favorite guitar company/model/finish, and if it was a Justin Bieber model would you rock it? If it looked the way I liked and played like a dream,I wouldn't care one iota. If my hello kitty strat had a floyd (and I liked strats) It would be the first guitar I played every time I plugged in.