There are a lot of reasons but the one you sited is probably most of it. He uses real names with the other supers to annoy them and show he's got something over them. With Gale, it is more that it is easier to think of her as a super than as the woman that left him.
And any grammar/spelling stuff you can send directly to Rob... written on a flaming bag of poop on his doorstep
Honestly, if you spend any time with these free eBooks you'll find yourself giving up on many that have multiple 5-star ratings because of poor editing. I was determined to have people hate my book because of the content/story/writing, not because I don't know the difference between there/their/they're. Rob and others (notably my librarian friend Theresa) really made this happen and I can't thank them enough.