but yes, like dark said, gray is nothing like sasuke. like one piece, fairy tail's core message is "i love my nakama". no one in the guild is like that, (not counting kana who i'm still sore on) and no one would betray the guild for power. gray is natsu's rival. its true but they are more like brothers than anything. they fight but they'd die for each other at the drop of a hat. similar to zoro/sanji. they cant get along for shit but they have each other's back, no question.
so once again, you make idiotic blanket comments without any understanding of the character you are talking about.