Yep Hopping doesn't have to mean your gain is someone else's loss.
How is that true? When you hop, the bitcoin pie does not end up getting bigger. But your piece does grow (hence why you hop), meaning that at least one person's piece has to shrink.
Unlike this quote from me a few months ago, when you physically add mining capability (or lower your rejects - they are the exact same conceptually), the bitcoin hashing pie really does grow. People still get what they deserve based on what proportion of the network they are. When you hop, you grow your reward per share submitted, which MUST mean other people's rewards per share shrink, right?