He never had control. His arm over his leg like it was was not controlling it. It was loose and on the edge of the mat.
I'm not going to disagree with you that it was a for sure takedown but what really bothered me is that Allen called it and then the 2nd ref comes in and waves it off. If Allen wasn't for sure on the call then don't blow the whistle because Reader finishes that move before the horn blows.