If making cases for Pokemon, there needs to more bulk in reasoning. Just the fact that a Pokemon has a niche does not mean it should get an official analysis. Even if a Pokemon does not have an analysis, it does not mean it has no use in OU environment. It just means that the niche it fills is so small, that most teams will go fine without them, and that they are not threats that should be explicitly analysed. That is why if you are making a case for Pokemon, it is recommended to support your case with more evidence, preferrably some in-battle material about how invaluable the Pokemon has been, and if that niche could be considered strong enough to do a full analysis on Pokemon (for example, see the length Jukain went to get some love for Weezing). If you just lump Pokemon like that on a list, no one will take your arguments seriously, and if the Pokemon hasn't gotten an OU analysis last gen, it will hardly get one based on just that.
Last gen, Yanmega, Uxie and Escavalier had no OU analyses. If you think they should get one, you need to show what has changed in the OU metagame that this Pokemon could be considered OU material. In my opinion, Escavalier has a chance of getting an OU analysis, but u need to have more bulk in your reasoning to convince people of Esca's usefulness. Yanmega and Uxie are more or less the same Pokemon, and it's hard for me to see how they perform better this gen comparing to the last one. Also, when trying to promote Pokemon, make sure your arguments and reasoning are as sound as possible, so that your case doesn't fall because you couldn't get your thoughts across. Venomoth is by no means the only QuiverPasser. Smeargle can do it too, and Masquerain also has the combination(minus the sleep-inducing move). You need to show how Venomoth fares better than the last two, and why QuiverPassing should be considered an OU-viable strategy. Froslass' niche of being the only hazard setter that can spinblock has been reduced with Defog. If you think Froslass is still OU-viable, you need to be more vocal on what Froslass has on Defog-users. These are just a few examples, but you get my point. It's better to handle one Pokemon at a time, so you can have a better chance of defending your point of view.