1) The E-V13s in Croatia appear in the Roman period, only one individual appears in the context of Illyrian period. This is not even a 5% ratio. You're not being honest in your approach. E-V13 is not Illyrian, that's clear as day.
2) Nish is Dardanian-Thracian territory, not Illyrian and we have a E-V13 that's autosomially where we want it. Nish sample is actually an argument for a west Thracian or Dardanian approach.
Go back to the the chart, the Bulgarian Bronze Age samples border the Paeonian samples, all central Balkans was initially Paeonian like, You can't rule out west Thracian or Moesian being autosomally washed in this R1b reservoir, the lone Nish sample hints at this, more data will clear it up. And the same goes for Illyrians, some of them, especially the Cinamak, overlap with Paeonian. You shouldn't ignore geography here.