For fuck sake what are you not getting? We have never said it's not impossible to get rejected by Jill, in fact we are all in agreement you can and do.
What is being discussed is can you go to Bianca's Dinner and then get rejected by Jill which so far seems mathematically impossible... Mainly because you must be nuteral at the fight for her choice... Meaning at best you've made 6 of 1 choice 7 of the other. If it was 8 Chick Choices to 5 dick. You'd be considered a Chick here and if it was the 8 Dik to 5 Chick you'd be considered a Dik and fail the check regardless.
So at this point there's only 2 choices left to make, the exams and the revenge. And at best your on a 7-6 run, you're either finishing on a 9-6, an 8-7 or a 6-9. None of which meet the requirements of 11-4 to get perm Dik or Perm Chick