You haven't addressed the fact that there is a period between Morrison's run up to Messiah Complex with Scott acting like Scott.
Everyone influences everyone. But the situation, the no more mutants, purifiers thing affected Cyclops the most. Emma had been present for two years prior to that with not much change in leadership. He was the good cop and she was the bad cop
When Emma pulled back her influence and took a back seat that is when he became the de facto leader and created X-force. That was his first step into that sort of radical leadership.
Emma was good before NXM. She became even MORE heroic during this period. Which is what made a portion of people complain.
Your whole hypothesis falls apart. As soon as Emma takes a back seat that's when X-force is created. That is just plain fact
Scott made those choices by himself. That was all him. He chose that path. He says so. He takes full responsibility. This has been stated numerous times