Ouch, ouch, ouch.
I'm not sure I've ever seen something quite as spectacular as that. I'm not surprised the ply let go rather than a glue joint, but I am surprised there was quite so much movement stored in the pine to do that. Presumably that piece of pine was not adequately seasoned and has had a major warp spasm.
I didn't suggest this before because you were beyond that stage, but have you considered a body cap for your original body? Something like a nice mahogany table top or something in the local furniture stores? Shave down the original and all the excess routing and give yourself a brand new secondhand top to finish how you like?
Alternatively your skills with assembling a body blank might be well directed with reusing shelves, table tops and the like, and the age of the timber ought to give you a stable blank without having to put the plywood layer in. Such timber won't be quarter sawn, but you could end for end pieces to even it out.
I really am not convinced that your plywood layer is gaining you very much in the context of a solid body guitar. Yes, you have transverse fibres, but they are in the middle of the body block so the effect is going to be minimal. And it's not as if there are really much in the way of transverse loads in a finished solid body guitar for them to contribute too.
OTOH I don't suppose it does any harm either, and judging by the look of things if you hadn't had the layer of ply in there the pine would simply have split instead.
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