I think the result of this fight will be learned before the end of the second round. At that point it will become evident who has the definitive upper hand. Who will it be? I'd agree with 65/35 GGG
I'd say rnd 3 should be the tell. That's usually when Golovkin stops feeling his opponent out and starts hitting his stride. If he's not looking dominant by the end of 3, it could be a longer fight. For me Stevens' chances are a lot slimmer however, 90/10, 15/85 at best, and that'll decrease by the round. Still, I see an exciting fight, and actually believe Stevens has a better chance than Macklin did. I'm thinking TKO5.
How? What's the big tell? Looks confident to me. Kathy's smirk is also a sign of confidence. Doesn't mean they're not worried about GGG deep down inside.
The moodyness and general facial expression. I think he's moody because he's really worried like he's really not looking forward to having to fight GGG. I can't read minds obviously but that's how it looks to me.