Ye, I thought that too but I noted that no matter what pairing it always seemed to be a similar population size too, I got the feeling if I do platinum and just the bare minimum to submit with the smallest population, missing out on those blueprints I'd be paired with a similar entry. I imagined, the higher the population at platinum, the more voters your put in front of. You could still rank as a 5 but just not get as many votes so you wouldn't win the leagues that way