>>14737465>Where did you hear that?He'll have got it from any of the ork codexes where they discuss how the Orkology works.
Spores produce mushrooms first.
Once there's enough mushrooms spreading spores, they produce Squigs.
Squigs feed of the mushrooms and spread further, producing spores that spawn Grots.
Grots start farming the squigs and mushrooms, producing a source of food and resources. Then their spores start spawning Orks.
The Orks pop up in the middle of a pre-built mini-civilisation which they take control over, then begin expanding. When they get populous enough, Oddboyz start spawning.
So if there's nowhere for the shrooms to grow, or they're weeded out, then you don't get an Ork infestation. Orks spread on planets where their spores are neglected and end up in the wilderness. And Orks don't spawn first because they're not exactly well-suited to building up a resource base to exploit- that's what Grots are for.