We really need to stop lionizing the position of majority leader in the senate like that. It really overstates their power and excuses other senators from doing their jobs.
No, it took votes of most of the senate in cooperation with the president to appoint ACB. Every senator should be held responsible for their part in that process, not just McConnell.
(Although yes, we also need to remember that RBG set the stage for this through intentional strategizing that didn't work out)