The Predators would seed planets with aliens by sending eggs in a pod. They had a captive queen for this. They seeded this human rancher world because humans had just arrived and the Predators didn't know about there arrival.
No one crashlanded on the planet, neither the Aliens nor the Predators.
The Preds ended up stranded, due to human interference, and the mass hosts available because of human ranching practices resulted in unexpectedly high Alien concentration, which ends up sucking lots for the humans, and for the preds.
Like I said, you weren't really off base, just in a few details.
And there were 5 issues. 0,1,2,3,4
zero was a sort of back story to the preds of the series, with a philosophical/moral discussion between the Lector crew providing a context of sorts.