There's bound to be at least one tie between the humans and the gods, so it may be this one.
But if that isn't the case, as much as I want Shiva to win, he may lose this round. Humanity becoming full of themselves and looking down on the Gods after gaining the lead would make for some interesting moments, in my opinion.
In terms of ability, I also hope Shiva goes all out. Given that he's the Hindu God of Destruction and Creation, we may see some interesting local changes for the Sumo Ring, which could allow for some amazing destructive feats from both sides.
Saw a few comments about Heracles and Jack Rip, so I think I'll post my thoughts about it.
Heracles, while he's good natured and loves Humanity, had a simple view of things. He stopped the Gods from culling Thebes and he quite literally thought he'd be able to do so again. He meant well, but he thought he could have his cake, i.e. participate in the tournament as a representative of the Gods, and eat it too, i.e. win his fight and have humanity spared at the end. In the end he lost, but even if he won, it is highly unlikely he would've been able to convince the Gods to spare humanity, especially with the death of Poseidon. I wouldn't be surprised if Brunhild knew that and why she was willing to go as low as she against someone we see she clearly loved and respected. There is no taking things to chance in this situation. It's all or nothing.
With Jack, I don't think we were supposed to feel sorry for him. His backstory gave a frame of reference of how he became how he did, as we saw with the other human contestants. In my opinion, the implications were he was always slightly terrible, but had another outlet, his mother, to use his abilities. Hell, it was even shown when that outlet didn't give him what he wanted, he immediately disposed of her. It was basically a way to show his emotional reading ability. At least, to me.