i didn't played Logan event yet but I do believe it involves someone else too.
I had in mind the sentence of Ruben saying he does not remember anyone who fits the characteristics that you describe to him, but I can be wrong though.
But why Nameless corrupted a lake if he could just corrupted Roushk and Othra and end the leadership of the lizardfolks? It would ruin theis society faster. And why he NEED them to be corrupted to get the gem? Maybe the speel of the lizards are something Nameless can not fight though?
I still believe Bernard has something to do or knows something of the Old Crypt. It's so strange the fact he is the only NPC you can talk about it, not even Harold who OWNS the bar. This man smells funny and I do think we can wait for more of him ahead.