I do not know if this will help you, as it is just a theory, but it goes like this...
We know that the group is split in loyalty, yes? So we have Marlton & Misty, and we have Samuel & Russman.
So, Samuel can hear Richtofen, which means Marlton & Misty should be aligned with Maxis! Now, if that IS infact the case, then we have to look into the idea that only Marlton or Misty can complete the steps for Maxis properly.
Now, when you place 1 turbine at a lamp post before you start the ToB, Maxis will say "Excellent, you have activated the 2 obtuse vertices of the sailing, quickly complete the tertiary node"
and, after this, if you place TWO turbines down at two lamp posts, Maxis will say "You have done well. Now activate the Spires, power. Are you circumcised? Oh hold on, blasted"
Why is he asking if you are circumcised? Is it maybe that Marlton is Jewish? If that is the case, where would Jewish people not go to on the map.... The CHURCH!!!
I tried this theory out, and as Misty, I went to the church with my friend who was Marlton! Now, when we got there, the church bell was ringing continuously every 25-30 seconds! Here is the weird thing! Only I (Misty) could hear the bells!! Marlton, and another friend who was in the game as Russman, could only hear the bell ring once walking past it, then every other minute!
I tried firing a War Machine at the broken part of the spire on the church, even throwing EMP's into it and Placing a turbine down beside the church, but nothing. We died soon after as we attempting to open PaP to try diffent weapons or scenarios.
I am only trying to take something from the Maxis quote, and yes, I could be wrong, but it kind of makes sense that the characters could be individually required for various steps! They (Treyarch) did mention something to that effect when they were doing Q&A's prior to the games release.