The ToS only defines the license to distribute and display. It does not define how users and consumers of that distribution may or may not use the content. So from this instance alone, there could be an argument of "the comment defines how it may be used".

No, there can't. If the ToS doesn't give you any permissions it means you have none.

When you post something you give the site a copy of content, under the license in the ToS. From that moment onward you lose all rights to that copy and cannot re-license or do anything with it anymore, period. It's not your piece of content anymore, it's the site's.

Your original piece of content is still yours and you hold copyright. That's the piece that you were holding on your device, in your RAM or on your disk, before you posted it. If you held onto a copy of it you have full rights to it. If you lost it after you posted it, too bad.

The site cannot re-license their copy under different terms because it doesn't hold copyright, it only holds a license (albeit under very wide terms).

Other users are not included in the license. They can't do anything with the content except what's allowed under personal use.