Aw, I love the gorillas. I'd be against having Diana to start palling around with Solovar, but Gorilla City's a big place, and these guys don't know Barry Wally very well. They're warriors, and there's only one warrior in the world worthy for them to follow out of loyalty. Plus there's the one who lost his life to Genocide.
But I do agree that Ferdinand should be back -- I don't see the gorillas as a block. (I'd also like to see Jumpa and Pegasus, let's have a party now that we have a vegan caterer.) :)