Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
My opinion about Latios is the same than it was when I posted in that PR thread. I think that it has a very important role in BW balance, and removing it would have a huge effect in the metagame, and we don't even know if the metagame will be better without it.
About Excadrill, I think that...
Won ggs
Go Troskgod!
https://replay.pokemonshowdown.com/smogtours-gen1ou-757579
https://replay.pokemonshowdown.com/smogtours-gen1ou-757582
https://replay.pokemonshowdown.com/smogtours-gen1ou-757585