Has Rob Schneider become Adam Sandler's bitch?

I think the title says it all, folks. Because I recently watched 50 First Dates for the first time (which turned out to be a surprisingly good movie!), and after seeing Rob Schneider's supporting role as resident moron punching bag, it suddenly dawned on me that he's been in damn near every Adam Sandler movie of late—and always in that same punching-bag role!

Think of such Sandler movies as The Longest Yard (where he had probably one of the best lines), Click, Big Daddy, Mr. Deeds, The Waterboy—all of them featured Rob Schneider cameos in some fashion. So having said that, I have to wonder why Rob Schneider doesn't return the favor with his own movies—by featuring Adam Sandler in an uncredited supporting role. (Though for all we know, he might have stolen the show more than Eddie Griffin did in Deuce Bigalow.)