I'm not really seeing much as far as anything that screams bud rot to me. I looked over this week and last week and the only thing that stands out is the last pic of last week has some dark green sugar leaves in the bud and the pistils are slightly discolored. That doesn't really grab me as bud rot or any other type of mold. It is possible for it to be bu rot just expressing itself a little differently so I would keep a close eye on it for sure, but honestly with outdoor grows it could be a number of things. Maybe a bug got in there and did something or maybe it is just some weird environmental or genetic thing. Either way, I wouldn't take any action as of yet. Let it play out a bit and see what it does. If it winds up looking more brownish and rotten then just chop it off. If not it might be just fine.