I am very surprised that nobody has replied to this question. Maybe the sumotori are too busy training to talk about it.
Did the famous Tenryu (see Aikido Journal interview at http://www.aikidojournal.com/article.php?articleID=449
) ever produce any aikido students of his own? Did he steer any other sumotori into aikido? Did any aikido teachers other than O-Sensei instruct sumotori, or take up the study of sumo themselves?