Gather everything in short:
1. At least one them (Nen or Radish) is Mafia.
2. In the unlikely possibility both are Mafia, they are trying to make one seem innocent by sacrificing the other. (I highly doubt Radish would do this)
3. Wonk made a big slip-up. He claims it was a innocent mistake.
4. Nen claims he targeted Radish 3 nights in a row, and all of them are perfectly spot on with the killing patterns. We have yet to know who he targeted day 1.
5. Radish claims he is a 50-50 doc:
5.1 Night one, he protected Rol.
5.2 Night two, he killed Mario trying to protect him, he became aware of that.
5.3 The two following nights he tried to kill Nen, but ended up protecting him.