Some questions -
What symptoms & testing for the original dx of rotator tears ?

No MRI of C spine before the surgery ??

Same Nero this whole time? Did he do the surgeries?
Might be time for second independent opinion, they usually won't want to admit if there was an error..

Get copies of all tests and imaging reports, in case you decide to get other opinions, it's easier if you have then yourself vs having to have things sent from one doc to the other docs..

Some people do create excessive internal scar tissue, but may or may not be the case.. keep looking for answers.

I don't know if any PT or chiropractic or bodywork of some sort might be helpful or not, I'd be tempted to try some of those at least a few times..