ok, Tony,
I'm going to make a suggestion here that will work if my assumptions on your set up is correct. I'm still not 100% clear on the focusrite saffire 56 and Octopre configuration. here's what I THINK you're saying you are wanting to do:
16 XLR SOURCES from the SNAKE
from those 16 SOURCES you want to use the PATCHBAY to split them into identical signals for output to:
1) mixer for FOH
2) a wordclock and ADAT sync'd system of the focusrite saffire 56 and an Octopre
if this is correct, then you can do what you want.
use the HALF NORMAL switch setting on all of the front panels through 16
connect the SNAKE SOURCE TRS to the TOP REAR JACKS 1 through 16
connect the TRS cables going to the MIXER to the BOTTOM REAR JACKS 25 through 40
connect the TRS cables going to the SAFFIRE/OCTOPRE inputs to the TOP FRONT JACKS 1 through 16.
this should give you what you're after provided I understand you are using the saffire and the octopre in parallel, not in series.
a side note: I would be more concerned with signal degredation from the XLR to TRS ADAPTERS than I would the patchbay.
another side note: you signal WILL diminish some using the patchbay as a splitter. I did not understand that from your question earlier about using the patchbay. I was not thinking in terms of using it as a splitter and did not understand that's what you wanted it for. so YES, it will reduce the signal some by using it as a splitter. how much? I don't know - you'll have to experiment and find out.