Thanks, Alfonso! 
 
BTW - when I was re-running our data through pre-processing.  I took a look at the Matlab processing log.  There are mean and SD values listed in this log for each subject with respect to "mean global" and well as movement parameters?  Is this "mean global" the same as mean global signal?  If so, then maybe I could just compare these output values between sessions and groups to show that there are no significant differences and forego the whole non-aCompCor reanalysis?
 
Warm regards,
Jeff