I have calculated the response of this new 2.5 loop system.

The first attachment is my block diagram of the system.  In the bottom left corner are the one-hop responses from each green-colored point to the next.  I use the same matrix formalism that we use for Optickle, which Rana described in the loop-ology context in http://nodus.ligo.caltech.edu:8080/40m/10899. 

In the bottom right corner is the closed loop response of the whole system.

Also attached is a zipped version of the mathematica notebook used to do the calculation.

EDIT, JCD, 17Feb2015:  Updated loop diagram and calculation:  http://131.215.115.52:8080/40m/11043