Extra Attack (Multi-Strike), Feints, Setup Attacks, Rapid Strike

[kflux]

I am changing my tune on my previous attempt at a summary of answers for Questions 4 and 5 shown below:

Originally Posted by kflux

Question 4: No, the penalty only applies to the first of the two rapid strike attacks.
Question 5: No, the feint effectively nullifies the benefit of the setup attack, so that the third attack in the sequence of Extreme Rapid Strike only provides the defensive penalty from the Feint.

These summary answers do not feel right to me. My updated summary answers:

Question 4: Yes, the penalty applies to both of the two rapid strike attacks. Just like Question 1. There is no reason that the first Rapid Strike Setup Attack would "use up" the Feint penalty in this instance.
Question 5: Yes, the third attack has the penalties from both the setup attack and the feint (in other words, the penalties stack in this case). The "trick" here is that it is happening within an Extreme Rapid Strike.

Very open to counterargument, of course, but for the moment, this is what feels correct to me.