According to Maxx Upolu does not play the HII -- only Savaii does -- Ozzy gives it to Whitney to play (based, I'm guessing, on their thinking she's Upolu's target). Instead, Upolu target Keith. Maxx says the vote is 7-5, which makes me think John voted with Upolu to begin with, but he might have the number wrong & John panics and votes with Upolu on the re-vote & Keith is booted 6-4 (Keith & Albert -- Savaii's target -- don't vote on re-vote). Technically, you could count the Keith & Albert's non-votes as votes against each other & count it as 7-5. I'm not sure what Maxx's "7-5" means, though.

If a 2nd tie occurred on re-vote, it would be 8 people picking. Those not picking would be:
Keith
Albert
Ozzy (won IC) and
Whitney (HII).

The odds of picking the purple rock would be 1/7factorial (7x6x5x4x3x2x1) before the 1st person drew a rock.

IMO, John wasn't going to do this when he gives Ozzy back the HII. I think he probably panics when he realizes that if he fails at his role as double agent (i.e., Savaii doesn't use the HII on the real Upolu target) he will have to face purple rock & he chooses to vote with Upolu rather than take that 1/7factorial risk. Now, whether that decision comes prior to the first vote OR on re-vote when it is revealed that Keith, not Whitney, is the target, I have no idea.

But nonetheless, even if John was going to do this, he still would have given Ozzy his HII back -- (1) an HII burned is an HII burned and (2) am I expected to believe that a guy who was too scared to face a middle-aged woman on RI was NOT going to hand the HII meekly back over to Ozzy when asked?