I wouldn't cut anything loose, yet. Use some matching or clear Monokote to cover the gap. I also use clear packing tape. Make sure you disconnect the control horn and bend the surface all the way over before you tape of iron the covering. Flex it back to neutral and run your finger down the gap to get the covering down in the gap, then touch it up with the iron.

If you use tape, as I do a lot, dump some talcum powder in the gap and shake it around or the tape will make sticking sounds for a while. I get comments like, "Hey, Ed, your wing's got arthritus, I hear it creaking when it moves."