I... don't see how any of those weapons really help... they're just like regular guns but more powerful.
I don't see how that stands up to a wide arc laser that instantly combusts any living thing it hits.
It would basically be....
Predator decloaks, and explodes an entire platoon of chimera soldiers in a couple of seconds. (Literally the thing blows up entire platoons in a couple of seconds.)
Quite honestly when, they were created and how their fiction developed... predators are really quite literally the badass aliens in their universe... by far.
The only reason it seems like the Chimera would remotely have a chance is because the most expierence most people have with predators is the predator movies.
Which, like I said earlier, is about the equivlent of a regular guy out hunting.
The Predator Military equips it's troops with ridiculiously strong nearly impossible to penetrate armour, personal anti bullet and missle technology, weapons like the above that can let a single predator light an entire platoon on fire. Mentally controlled blades that cut through entire groups of people. Sniper rifles that take out an Alien Queen in one shot.
Ships that can badly damage other planets and pretty much 1 shot any ship out there and are invisible to other ships.
Really, for the Chimera to have a chance you gotta figure out how can the Chimera negate BOTH the Predator's cloaking devices and their Mothership's cloaking device?
If they can't.... that means the Predators are going to
A) Be able to dictate where the battles are fought
B) Get first strike often with weapons meant to take out an entire platoon of troops.
C) Be able to disengage from the fight at a moments notice if things look bad.
Predator's can do everything the Human's did about 100 times better... and while the Chimera likely could do things a lot better then the humans too... no human army would stand up to the predator army.
They'd be at a fairly big disadvantage even if they got rid of the Predator's cloaking... but with it. It's not even a fight.
I mean... Predator's keep alien's queens locked up to hunt their children... for fun.
Alien's vs Chimera would be a more interesting fight honestly. Does the virus effect low intellect animals?