Well the issue is you would think Luka would say some cute shit like "Oh wow I don't think Bachi really needed to clear me here I think he could be town or..." whatever.
Instead he said nothing, and then Bachi gets clapped.
I was suspect of Bachi but honestly I don't get the impression that was picking up too much traction, so the general consensus is that SK shot him, possibly because of believing the tracker claim at face value
However, if Luka is SK it introduces other potential explanations. If he shot the previous night, he would know Bachi was lying, so maybe he shot him to townside because town was losing