We can kill two birds with one stone. Everyone saw in Vega's voice a hint that something is wrong with Kosha. And some also consider her suspicious.
We execute Kosha, she's Mafia - Vega is a cop, she's innocent - Vega isn't a cop.
execute Kosha
Added after 47 seconds
Look at who voted for Kitz and how, what conclusions they drew, and don't be stupid.