How to filter only one user contextually

Hi all,

Stuck on an issue - hopefully simple and I'm just missing the boat here:

I have a blog pane I'm using with organic groups. The contextual filter currently filters put all blog entries outside of the current OG - which is great. Yet now need to separate the OG managers' posts from the rest of the group's. I was able to create a separate pane and filter out all but the group managers' - success!

Now however I'm having trouble getting a pane which displays everyone's posts EXCEPT for the group manager's.

I am suspecting i might somehow need to utilize the "exception" feature of contextual filters but not sure if that's the case or how to if so.

Thanks!