The situation kind of left me in conflict in regards to Athrun, so I said both 'can' and 'seemingly' (as opposed to do/does). In this episode, it, at least to me, seemed slightly as though Athrun went seed under pressure; I'd like to think he did it with the same control as Kira has though, since the characteristics for that kind of seed activation were unlike, for lack of better example, Shinn's.