I supected that to happen. I never thought his friends would distance themselves from him. But his grief (and their's) comes from the fact that Cross is dead. It was clear that they know that much.
But there is no sign that Allen got his message yet. And I doubt that he told them that he'll turn into the 14th. I think Hoshino wouldn't do that off screen.
And while they have Allen under supervision I'm surprised that they let him go on missons. He's out of the order and could turn against his friends any second for all they know. And since Allen is no weakling he could do some serious damage.
I had imagined that they'd restrain his arm like in the meeting with Cross and have him in his room under guard or something like that. Not that they would let him go out to hunt Akuma with one guy watching him.
But maybe they need him or they really trust him.
"For Feanor was made the mightiest in all parts of body and mind, in valour, in endurance, in beauty, in understanding, in skill, in strength and subtlety alike, of all the Children of Illuvatar, and a bright flame was in him"