I was just wondering, whether it is possible for any ADC (regardless of their build) to beat these champions in skirmish separated from their team. At the top of my head, I’m thinking maybe a very good Vayne or AP kai’sa or Nilah could do it or maybe AP varus?
No, none. It’s not even close. There’s a reason why you never send the ADC to match a splitpushing bruiser at any point in the game. Jax will just helicopter perma-E dodge every attack, Fiora can do 100% max health true damage with vitals, Yi will easily win once he gets inside Q range, which happily outranges almost all ADCs, and gapcloses any ADC that takes the time to launch a single autoattack.