On the contrary, I do not see how you can ever be remotely certain what effect a Pokemon has on the metagame unless you see what the metagame is like without it. And the fact that opinions on Salamence do vary is evidence that its effect on the metagame is not unambigiously visible in standard.For a start, why is there to be a new suspect ladder without Salamence? This raises two primary concerns to me. For one, I cannot see why a metagame without Salamence has relevance to Salamence's tiering. It might raise bias as to people prefering a certain metagame to another, but what does it prove? Salamence's effect on the metagame is visible in Standard, a tier without the suspect seems pointless.
When considering tiering, we speak of Uber characteristics and Pokemon being "too powerful". But ultimately, I believe the question to ask is whether OU is better with Salamence or without.
Maybe the idea is also that the ladder creates an "effort requirement". By putting in time playing on the Suspect Ladder, a player demonstrates that they are willing to commit to suspect testing and invest time and effort into it. I would expect that when Aeolus and Jumpman consider who will be in the council, they will wish to choose people who will be able to engage well in it. The council is not intended to merely be the top 9 on the OU leaderboard.Also, is there a reason why applications aren't taking place now? Four weeks is hardly enough time to make a person qualified for the council who wouldn't have been before.
But it's probably better if Aeolus himself answers these issues, since he can do so far better than I can.