Why would someone send shock out for rebuild and acquire fork, headset, & seatpost without taking time to first inspect a new old used full suspension frame? These are mysteries to some of us and hopefully valuable (albeit somewhat costly) lessons to others.

I personally wouldn't feel comfortable riding with a crack like that any further than what it took to get out of the woods. Although with the inherent lack of lateral stiffness in that design I would likely tear the back off that bike even if it were not broken.

I did not vote in the poll as I do not fully understand the choices, but I do wholeheartedly support the OP's right to weld (JB or otherwise), duct tape, or popsicle stick & elmers glue it back together. Might as well get the most out of this exercise.