I tried unsuccessfully to get the Doughnuts to protect workers early, and not doing so resulted in the 1st war with TNT. One of the key MP strategies is to disrupt the other player / team by wandering around their lands, keeping the workers from doing as much as they'd like.
At this point losing the worker would be a disaster we can't afford. They could declare, capture, disband, and run. We wouldn't have any real counter to that. We can just cottage another floodplain and switch production to an escort, and do the copper after the Aloha warrior leaves.
In the meantime, now that we know two competitors we'd better start looking at the statistics a lot more.