Wasn't it someone other than Jared (Ben or Jensen?) who said that Dean would be upset at the reunion that Sam hadn't looked for him? That seems to confirm that at least as far as Sam tells Dean, he really didn't try to find him. I'm having to fall back on Sam lying to Dean for some reason to be revealed, but if that's the case I don't think Jared knows (which doesn't mean it can't be true; Jared didn't seem to know about soullessness this time of year before s6 and gave some ultimately misleading reads of Sam's behaviour).
Re: MORE SPOILER DETAILS
Wasn't it someone other than Jared (Ben or Jensen?) who said that Dean would be upset at the reunion that Sam hadn't looked for him? That seems to confirm that at least as far as Sam tells Dean, he really didn't try to find him. I'm having to fall back on Sam lying to Dean for some reason to be revealed, but if that's the case I don't think Jared knows (which doesn't mean it can't be true; Jared didn't seem to know about soullessness this time of year before s6 and gave some ultimately misleading reads of Sam's behaviour).