i dont' see zeke having a reason not to like him, he's just really reserved when someone new enters his life because of the things that he's gone through in life. with work it's a little different so he tends to let those walls down a little quicker because he doesn't have to show all of himself, if that makes any sense. but he also knows what it's like to have been a rookie so he'd check on grae to make sure things were still good or if he needed to tell the others to back off a little.