Obi-Wan would solo sabers only, with Kit added in it would be a 10/10 slaughter in sabers only. Tenebrous could possibly ragdoll, but Saesee and Ti's presence make it impossible for Tenebrous to focus on removing Obi and Fisto.
If he focuses on ragdolling Obi and Kit, it allows Saesee and Shaak to react quickly and take him down.
He can't ragdoll all of them; he can just push them around and harm them, but that's it.
If he focuses on removing the weaker duelists but greater Force users, with the idea to get Obi/Kit later - when he focuses on ragdolling Shaak alone, Obi or Kit can remove his head in the meantime.
4v1 is just shit Tenebrous is never going to win.