I had some reasons I didn’t pick the ones you included.
Willingness to change mind when presented with evidence
I could see someone rationally taking an anti-dialectical stance if they think that the evidence they are being given is somehow not valid or biased such as to be an example of bayesian persuasion.
Interest in improving reasoning and decision-making skills
Someone could be committed to the goal of discovering truth, but also not be able to currently prioritize it, and so they may have no interest in improvement at the time.
Commitment to intellectual honesty
I believe one could rationally decide that the best way to achieve a goal of truth discovery might not involve intellectual honesty in a given circumstance.
I want to come to this! Sent you an e-mail. :)