Technically speaking it should be impossible for Ainsworth to win. Though, the issue here is not whether whom owns the copyright, rather, the written agreement, if any, defining the disposition of the final product. The items were sold to LFL. LFL will now need to produce EXACT technical drawings, drafted or otherwise, to prove the items were in fact intellectual properties of LFL, prior to purchasing the items from Ainsworth. I have never seen any imagery, other than what we all have seen, which is MacQuirre's illustrations, Mollo's designs, and maybe some from Johnston, that is exact in comparison other than likenesses (which may prove to be enough, anyway)
Also, let's remember the era in which this situation derives from. People did everything on a napkin, handshake, over a beer, ect. It's highly unlikey there would have been a written legal agreement, other than a proposal. This film was not a HIT rather a beleagured production rife with all kinds of issues, where it almost got canned by the Exec's., no pun intended. Shoot, Seeker could be right. This is gonna be very interesting to watch.