A weak fan (1 blade) cannot push a fat neko. However the 2-blade fan can. You need to be mindful of what button Arista is on, as too much power will activate either of the pushers.
I forgot to put a monitor on the weak fan, but that one does need 3 power to shut off. So once you push the timer button and the big blue button, you should be able to move the neko through at their thin size.