How do you know their seeds are undeveloped and the germination rate is shit if you have no experience with them? The OP had some issues and the seeds were replaced. Maybe they were old. I don't know. Shit happens. But name any seedbank or breeder and I can find someone that had poor germination. Just because you had all your seeds from one bank germinate and then read a post where someone had poor germination from another bank is not enough valid data to determine if one is better than the other. Myself and many others have grown Cannabiogen genetics with great success leading to good harvests of excellent weed. I've never gotten anything from Greenhouse so I don't know anything about them.
Anyway, if it sprouts grow it. If it doesn't plant another seed.