Drying wood in our attic is a iffy thing. In the winter it would be OK but as soon as the attic temps go about 90 degrees your wood could do some serious warping and checking. Others say they have done the same with no problem, attic drying went bad for me every time I tried it.
On osage trees, a tree may have fruit one year and the same tree might not have fruit the next. Like oak trees, some years there is a mast crop failure and trees don't produce acorns.
Osage trees without thorns are out there as well, not many but I encounter one every now and then.They will have no thorns on the tree but will put up sprouts from the stump with thorns the next year after you cut the tree.