I got some pics of what I'll be fixing. Guy is forbidden from working on this any further. He's a painter. let him paint. He can even seal the deck when I'm done.... just don't let him touch my saw again.
He just paid no attention to what had been done, and very little to what he was doing....
I use a nail to keep the expansion gap the same everywhere. I just put the nail between the board I'm nailing and it's neighbor to keep them parallel. Boards have crowns... sometimes you have to bend them a little to make it work....