CPPD reconsideration stage

This is a great forum. My case is with the benefits officer and still in review. It’s past 200 days, however application was complete on May 25. I have called Service Canada a few times most recently to check on the status. The last medical history submission was on July 2nd, it still says active. One agent told me yesterday I would be receiving a call on August 26. Today I called back to confirm that date but this time the agent said for me to call on August 26. I have had the MLA intervene with submitting medical records. I understand it takes 90 days from the day it was complete.

My question is what does the benefits officer do? Agent told me today they take part in the decision making but I have also heard they have nothing to do with the decision. Any ideas?