1. I am not a fan of 3Gaspy. I've never had much trouble fighting against him, especially compared to other Cryx options. I don't know about other Hordes armies, but as Skorne my anti-cryx drops have very few beasts for the feat to do much, but still have enough hitting power to deal with a Kraken when there's no other big targets. Ashen Veil is always nice vs Hordes, but with more non-living options (been seeing lots of witch doctor crocs and shamblers lately) it's becoming less back-breaking. He's not terrible, I just don't like him much.
2. the Goreshade list looks cool. still haven't gotten a chance to play against him, but he seems solid, and I like the list with him. lots of ghosts + cav seems like a strong way to play him.
3. Denny is always good, regardless of what models go with her. I think Rev Crew are decent, if nothing else they are something that has to be dealt with in a specific way that distracts from dealing with more vital things like Nyss.