Look up “strategic framework agreement”, not SOFA.
Pay attention to the timeframe of Obama’s actions & then read this:
http://www.iraqupdates.com/p_articles.php/article/32972
Thanks!
I also later found some articles in the early July timeframe that say that the Iraqis would not enter into ANY agreement that did not include withdrawal of forces.
So that’s the best I can make out. Delaying the agreement delayed the troop withdrawal guidelines.