They simply should have paid him.The only defense I can offer for ENT's solution is that any often repeated solutions already out there from 1979 to when they made that stupid episode couldn't be used for them to get credit for it. So all of the much MUCH better explanations couldn't be used, they had to come up with something batshit crazy for them to call it an original idea and get paid for it. Otherwise, they'd have to pay John M. Ford or someone else who came up with those better reasons.