In general I think the likely benefits from the linked identities will outweigh the costs. Being known is often better than being unknown even if the reason for which you known isn't super-special.
But he can link the indentities later. Unlinking on the other hand...
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threadspage before posting.)
3. Open Threads should be posted in Discussion, and not Main.
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