The lower case glued seems to be glued down.
While trying to open the lower case of my late 2013 retina macbook pro 15in so I can clean out the accumulated dust (fan seems to be working harder than before), I've notice that the lower casing was being held down by something in the middle. (I have completely removed all scews and pried all four edges up.) On the second step of this link, a reader has also made a simular comment. I would really appreciate some confirmation as I do not want to risk damaging my rmbp.
Is this a good question?