Well, the same comment by you that mentioned quid pro quo, also dealved into collusion, as the quote above also does. Further, he directed you to a comment that spelled out the evidence that Mueller compiled that amounted to evidence of collusion by members of the Trump campaign.
As I made an effort to explain in comment #5520, which
@silesian directed you to, there was indeed evidence produced of collusion. If you went by what Barr said, when he tried to diffuse any major impact the Mueller report might have, or if you are convinced by Trump following up on Barr's deception by repeating "no collusion, no obstruction", over and over and over again, then that might convince you that "collusion part was already settled". That's not the case at all. It also helps to know authoritarian leaders use the Big Lie as a tactic to control public opinion. In this instance "no collusion, no obstruction", neither of which is absolutely true, it still can be fairly debated, is such a Big Lie. This is Authoritarianism 101. Repeat a lie often enough, and it will be believed. In this case, some of us were not fooled by the Big Lie.