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I am aware of good testers closing the FTP gap to a few %, but they are probably not as fit as they would be had they done more training in a traditional position
I'm pretty sure I never fell into the category of being a good tester, but when I was racing TTs a lot my average power output was always the same as on a road bike, to within a modest margin of error. I suspect that's because I was only racing on a TT bike, and that made up quite a lot of my 'training'.
I am aware of good testers closing the FTP gap to a few %, but they are probably not as fit as they would be had they done more training in a traditional position so it's not something I focus on or try to compare.
I think Bigham interviewed about narrowness of hands which he says generally tests faster on almost everyone, and is roundly more uncomfortable for everyone...but it is inherently trainable eventually without physiological limitation on power output.