I'm pretty sure they could beat the AOTC version of Ob-wan. Jocasta never struck me as anything special, but Sora would be the challenge for good ole Obi-Wan here. Here's how I see it: Obi and Sora are about an even match, and then with Jocasta in there, she would just be a distraction really. So, overall, Obi-Wan loses.
Sora is about equal to AOTC Obi-wan, maybe a little better. Jocasta I have heard was a Council member until she retired to take over monitoring the Archives. She would beat probably close to Obi-wan in a fight. AOTC Obi-wan isn't to amazing since he spent several years from TMP spending all him time on Anakin and then later on learning a new form. His form four skill was probably about the same. Form three was not really effective because he didn't seem to know enough of it at this point.
Jocasta and Sora win by a lot.
Yeah, I missed another Vercetti sock...damn...
Anyway!
Sora Bulq was one of the greatest swordsman of the Jedi Order, under Mace Windu, Yoda, and Dooku, of course. He aided Master Windu in creating Vaapad, though he did not master it completely. He fell to the Dark Side.
I would put my money on the Sora Bulq and Jocasta Nu duo against Obi-Wan. Jocasta must have had some pretty decent skill with a lightsaber since she was a Council member, and Bulq was spectacular.