I agree with everything you say except Kim P. being an outside option. In my opinion, Brandon is such a wuss that he would balk at voting off his former GXA buddy, but otherwise might follow his Boran new alliance in anything else. Lex's gut (absurd as it is) led him to ally with Brandon so he probably won't stress the guy too much by targetting his former GXA pal (which he knows from by having been in Samburu II), so if Lex is smat (iffy but possible) he will go after Frank or Teresa next. His bad gut likes T, who knows what that's about, so Frank would be his obvious pick. Would Brandi go for that? Smart as he seems, Brandon isn't RichHatch, he doesn't do devious all that well, so he might not consider realligning with Samburu beyond carrying his former pal (Kim P.) as far as possible (despite how she may react to his defection).
PS: had you stuck around chat I would have agreed with you.
"If all machines were to be annihilated at one moment, so that not a knife nor lever nor rag of clothing nor anything whatsoever were left to man but his bare body alone that he was born with, and if all knowledge of mechanical laws were taken from him so that he could make no more machines, and all machine-made food destroyed so that the race of man should be left as it were naked upon a desert island, we should become extinct in six weeks. A few miserable individuals might linger, but even these in a year or two would become worse than monkeys." (Samuel Butler, "Erewhon")
I am leaning toward option A. I just don't see Ethan and Kim voting aganst Lex at this point since they have stuck with him through his dumber moments. Tom's statement during the previews does bring his own tie to lex into question, though, and he hasn't had an original thought yet. Plus, that would be an awfully obvious clue if Tom and OB turn on Lex. The betrayal, though, could mean that one of them crosses over or considers it. Who knows? Maybe Tom pushes for Brandon to target Lex while they are on their date (I see the two of them being hte unlikely couple). Tom knows he is vulnerable and not much of an immunity threat.I think Brandon will prevail and convince KimP and the OFA that he had to do what he did and do it secretly to preserve their advantage. KimP may be pissed, but she wants to stay. Teresa is smart and so is Frank. They may make a move to OB to see who bites and might join with them, but they'll stick with the ones who can take them the farthest...with Brandon and Kim, they are in the final 4--with Boran, one of them is #5. Frank and Teresa will stick together like glue. Neither is going to sacrifice the other for a chance to still come in #4 in an alliance with OB.
Kim--confused as ever