In my opinion both guys did wrong. Masea shouldn't have pushed Gaios and be so negative about him because he was not doing anything. He's not paying him a lot of money to expect so much of his effort. If he doesn't want to work on it, then he shouldn't.
Gaios on the other hand reacted too rude to Masea and his impatientness. There's no reason to tell someone to fuck himself just because you don't like to spend your freetime on it. At least you could've said that you feel pushed and therefore you don't want to work on it.
After all of this I only wish that you guys just don't care about the copyrights and upload all your progress that you've done by far. If someone else has the interest to finish this mod, then this would be the best way to make it possible.