"He has made no connections with the men on his tribe"
There's something in the preview for next episode about him roping in Coach (which doesn't surprise me, as he's the best analogue for Shambo I can think of).
"and the two women he aligned with, one appears to have jumped to the majority"
That's unclear to me, but like I said, she could jump right back over if Russell has the idol.
"the other is smart enough to abandon him at the first sign of trouble"
Smart she is, but I'm not sure she has anywhere more attractive to go, for the time being.
By the way, I think there are signs the Russell alliance could pull in Jerri. She has a secret scene where she bitches about Rob's bossiness. If that happens, there's a very good chance Russell, Parvati, Danielle, Jerri, and Coach go up against Rob, Tyson, Sandra, and Courtney. Before you say Coach'll never vote against Rob, maybe they won't need Coach's vote. Maybe they have the idol, or maybe by the time they get to Rob, his alliance has lost a member (Courtney for being a challenge liability?). Or maybe if and when they get Jerri and/or neutralize Coach, Sandra's "anyone but me" mantra kicks in.