At that point where Robb had left, everyone (except Ken) was starting to gang up on Shii Ann as Shii Ann and Ken bashed the hell out of Penny. The rivalvy ended after the fake merge where Shii had been screwed over by a twist with even Ken mad that she was starting to turn on them.
Well Shii was also close to Jake, but yeah she was closest to Ken. I don't remember Jake joining in on the Shii gang-up, mostly Penny/Erin/Steph/Jedd/Rob.

Jan told Brian about Ted and Helen writing in the sand. I'm not 100% if Helen was going to go through with it, but she definitely was plotting against him that's why during Helen's FTC question, Brian was saying how Jan told him that Ted and Helen were plotting against him in the sand which was the reason why he voted for Helen. (I think that was pure BS about Jan lying, but Helen admitted that she was plotting against Clay and not Brian)

honestly? I swear I thought they were plotting against BOTH Brian and Clay, because post-interviews said that had Jan and Helen actually had a brain, they would have teamed up against Brian. Yeah, Helen ultimately stayed loyal to Brian, but just like Katie (who is so underrated it's ridic) she plotted against her F2 partner, and was actually willing to follow through. It just never came to fruition. Helen <3 btw.