Really? You don't think the sort of person why tries harder than average to actually change their mind more often will also try harder than average to examine various issues that they should change their mind about?

But that isn't the issue: it's noticing that there is something you need to examine in the first place, vs. just "knowing" that the other person is wrong.

Honestly, I don't think that the skill of being able to change your mind is all that difficult. The real test of skill is noticing that there's something to even consider changing your mind about in the first place. It's much easier to notice when other people need to do it. ;-)

Inasmuch as internal reflective coherence, and a desire to self-modify (towards any goal) or even just the urge to signal that desire are not the same thing...yeah, it doesn't seem to follow that these two traits would necessarily correlate.