And the winners are... Artemis, Option and Myates!!!!
I put all 3 bettas in last night. After I saw that ther was no immmediate aggression, I turned their light off & went to bed.
FF to this morning; everyone was lined up like cattle for breakfast (as usual), but during the feeding frenzy, the larger yellow VT (who we suspected was male) started nipping, flaring, and chasing. I noticed that "his" fins have been nipped. I gave this behaviour about 10 minutes before I netted him & plopped him in a "timeout" tank.
So, the three of you who guessed correctly get first dibs on a free fish!!!
I have plenty of tanks to house another male, but if I bought a male, it would be to breed one of my ladies to. He's strictly ornamental, so I don't want to devote another tank to one fish. That much more work I don't need.