Does it need the links to trace?
Not quite sure what you mean, but if it's a true orphan thought you obviously can't reach it by navigating the plex.
You can still find an orphan thought even though it isn't linked to any others. For example, if you created a thought named "MOT - My Orphan Template", typing "mot" or "template" into Instant Search would find it. In fact, if you selected All in Reports, it would be in the list. If you filter for Orphan Thoughts, you will get only orphans.
This filter always takes longer to display since PB does not store a list of orphans so has to check all thoughts each time. For this reason, if you frequently use just one orphan as a template, pin it up, or if you have several, create a tag named "orphans" and tag them all with it for faster retrieval.
Another trick might be to create a Custom Report (Pro version only I think) in which you only want orphans to be displayed.
Remember too that if a thought has links attached but you have somehow filtered out all thoughts to which it is linked (using Filter > Inverse), it will appear as an "orphan" in the Plex - you won't see its linked thoughts till you uncloak them by turning Filter > off.