I'd say she stops at 6 or 7 depending on if her sword can hurt either Colossus and Megatron. I actually think Colossus has better durability then Megatron, though can't be sure. If Alita's blade cuts them she wins easily. If not she hasn't shown significant enough strength to be able to put them down. If the sword is out as a viable option then Colossus or Megatron will eventually grab her and tear her apart.
He will be missed. Personally no man in the comics industry has affected me more then the legend himself. I know this might sound foolish but the characters he created and the messages they conveyed helped to shape a part of the person I have become today.
I see Venom pulling a majority in a pure H2H fight, but the Ultimate Predator wasn't put down by anything less then his own weaponry and a huge bit of luck. And while Venom stands at about 8ft tall Ultimate Predator was stated as being 11ft tall in the movie, so he does have the size advantage in this fight.
If weapons were allowed in the fight then I'm sure predator could take a majority especially with the plasma canon.
This is pretty much why I never understood the logic in the accords from the Avengers or the public. Realistically the only people who should be wanting this is the government, as they would want to have control over the most powerful beings on the planet.
But the basic concept of the accords is if the government deems a situation to be dire enough we'll send in the Avengers. So essentially they are saying we wait till enough property is destroyed or people are dead to then send in the Avengers to stop the villain or world ending event which if the Avengers were allowed to act on their own they could of prevented it anyway. They would of had their own casualties if they acted alone, but it would of still been far less then that if the accords was to send them.
I see it like this:
Accords scenario - we wait till 100 people die to then send in the Avengers where in their attempt to save the day a further 20 people perish
No Accords scenario - Avengers act upon the the threat immediately prevent it from escalating and sadly 20 people get caught in the cross fire and perish, but at least it's not as bad as it could have been. And yes 20 lives is a tragedy but it's not like the Heroes are actively aiding in the murder of these people. The Avengers have time and again shown in the films that preserving human life is the top priority above defeating the villain, with cap making sure to send the team on detours to protect civilians.
And if we think calling out Stark for making Ultron, as a way of saying that if the accords were in place that would have been prevented, you are wrong. Had the team known Stark and Banner was going to do that as was stated in the film they would have stopped him. The government having control over Stark at that same time in his life wouldn't have stopped that, if he still believed that Ultron was what he needed to protect the Earth and the government disagreed with him on the matter then he would go behind their backs and still make Ultron much like he did with his team whom you assume he trusts more then a bunch of faceless suits making dumb decisions.
Tony would never have agreed to the Accords if he wasn't wracked with guilt at all the mistakes he made. I believe a part of him understood that in homecoming, so he maybe kept the government of Peters back while he operated on a small scale, hence why he didn't want him going after the vulture and drawing more attention to himself.
And it always confuses me when people use the argument of "what if a hero turns bad wouldn't you want the government to keep them in check". But honestly what difference would that make. If a hero turns bad if they are registered or not what would be the difference in outcome of what occurs following that.