I always thought there was a lot of potential to Nemesis Prime as a character but its never fully grasped as a lot of time its just a copy of OP or some other character who has fallen into darkness, they never truly taken the time to explore the idea of Optimus prime abandoning his morals to become Nemesis prime and become a threat greater than that of Megatron and having wreaked havoc across one universe, he goes back in time and has to face himself or a slightly different verison and OP has to question his moral code and ask himself, is it truly worth protecting human life at the cost of never being able to restore Cybertron to its former glory, I mean if you look at the human race, we are a voilent race of beings and there always some kind of confict going on, so Optimus should ask himself, are they truly worth protecting and prehaps the verison that becomes Nemesis has been worn down by endless war and his officers bickering about how best to carry on the war, but then there is a trigger for Optimus to just snap, one thing I liked about IDW first run with the Matrix and a bit from Marvel run, is that it can be croupted or hold some kind of darkness within and it could boost the darkness within Optimus aiding in his fall!