Dan,
I seem to recall being at a Bellanca Owner's Group banquet at Oshkosh years ago when August Bellanca was the guest speaker. If my memory serves me correctly, during the Q&A session after his presentation, he said that the "elephant ears" were added at the very last minute to resolve the spin recovery problem that they were having. They were literally down to the last day to get the plane certified or they would lose their funding, and the plane would just not pass the hands-off spin recovery requirements. It would take too long to enlarge the vertical stabilizer and recover the tail, so as a last, desparate measure, they tacked on the aux fins and got the plane certified. Since it was certified with the fins, that was the way that they had to manufacture it. Then the triple tail kind of became a signature of the Bellanca planes to the flying public and they kept it through later designs.
By the way, August is an innovative engineer in his own right. His Skyrocket II composite airplane is right at home in today's market, but it was designed waaaay back in the 70s, if I remember correctly. About the time of the Windecker Eagle. Unfortunately, he was unable to get enough venture capital to get the plane into production. The plane was possibly too far ahead of its time back then. That seems to be a common thread throughout the Bellanca history.
Dave