I got a better explanation.
Basically all hunters are clones. The real hunters somehow died in battle with the monster or maybe of old age or something (doesnt matter).
Did you guys notice the strikes , when you spawn from the ship? Did you notice the lazzy device?
So here it goes.
For the first time in every battle those hunters are matured clones, aka full version of their original. So they are strong, their DNA integrity is strong aka max HP. In battle hunters loses and vals gun is made to repair the DNA and give the hunters more HP but there is point at which val or other medics cant restore the integrity of the DNA. So inorder to overcome this issue, lazzy was introduced.
When a hunter goes down, lazzy can use the device to restore the DNA to its original state but if the hunter dies,then its a different story. A new clone is sent from the ship, but the new clone was sent so fast that it never got matured to its max state which means that its DNA isnt strong aka lower hp aka 1 STRIKE. If that clone dies, a more early version of clone is sent, aka 2 strikes.
The lazzy device can restore the DNA to original state if he can get to the hunter before its eaten and full restoration only possible with fully matured clones else its partial restore. Basically lazzy device can never bring back dead people back , but instead it can only bring back clones and give it DNA restoration. [ Thats why you can never revivify dead colonists).
Also sometimes you can see lazzy saying that he should revivify the monster, which also gives us an assumption that monsters are basically CLONES (Pacific Rim). Those monsters are genetically made and sent to take back the planet. You can also see that sometimes hunters say that these monsters are NOT from the planet and they started attacking at some point while colonizing the planet.
So Tdlr :-
Hunters are clones.
Strikes are DNA integrity lose.
Monsters are clones .
Monsters are not from the planet.
Monsters were sent to the planet to take back the planet and probably wipe humans away from the planet.
Well this is what i could comeup with !