I just spoke with Mr. Boeree about the ALL and this is what he said (from memory so I might be a little off):
The ALL is divided to implant the device and no effort is usually made to fix it, because it would just turn into scar tissue with no benefit to the rest of the spine. This was an issue in older generation devices as they were unconstrained, so they had to keep part of the original annulus in place to prevent pop-outs of the prodisc and charite in extreme extension. The artificial annulus of the M6 lessens the importance of the ALL and flexion/extension are not an issue.
My Take: He didn't think it would destabilize the spine at ALL (bad pun), though he did offer to stitch it up for me if I would prefer! Again, it just becomes a bunch of scar tissue with no elasticity.
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