i don't know about AJ but i think i understand Big Macintosh's cutie mark perfectly, actually. it's a half of a big green apple, and i think it represents him perfectly. the apple has a tough durable exterior, yes, but it hides a soft inside, just like big mac. on the outside, he's a huge strong muscular earth stallion. but once you get to know him, the real big mac is quiet, shy, thoughtful and as gentle as a little lamb.