One thing that always bothers me about Butch

That makes absolutely zero sense. What offspring? There's no evidence he has kids and he obviously doesn't if he's on the run to another country without them. If he's afraid he's going to get killed there.... how is he going to have an offspring if hes dead?
There's no evidence Fabian is pregnant, and even if she was.... she has no idea about the watch, does she? He obviously has never told her.

Could be. But I wouldn't buy it. He knew all along what he was doing. Granted he didn't know he was going to kill Floyd, but he had every intention of winning the fight and then getting the fuck out of there. I think the window was the plan all along and he had Esmerelda all lined up to go. Either way, I don't see why the watch would hinder that.

This explanation is most reasonable.

However, it creates a brand new issue I would have with Butch..... if he's leaving the watch responsibility to Fabian because he doesn't know f he'll have time, why the he'll wouldn't he explain the watch to her beforehand? I suppose he admits his fault to an extent.
But goddam, if I had only one small sized possession I cared about while fleeing for my life, I would take the 90 seconds to explain it to the person I was entrusting it with lol