I'm not being clear enough. The extra brace I'm going to use is to allow the rear wing tie-down bolt to actually contribute something to the front-back support for the wing. As it is, only the front wing hold-down bolt is bolted into a support that has front-back rigidity. By giving some of that rigidity to the rear cross-brace, the rear wing hold-down bolt can backup the front. As it is, the rear brace has no front-rear strength to transfer into the rear bolt. Until it has that strength, the rear bolt does only half the job it could do so very easily.

As it is, the front bolt will have the opportunity to wear out it's support in the wing. As it becomes loose in the wing, there is no backup to it's front-back wearing. By stiffening the rear support by utilizing the surplus rigidity of the front cabane and it's DIAGONAL brace (the brace that supplies the triangulation we both understand completely), the rear bolt will double the front-back support for the wing. That way, the front bolt actually won't have as open an opportunity to worry it's support from within the wing, and there will probably be no wearing.

Sorry that I've not emphasized that point more strongly.