Zed Counterplay Suggestion(ult tweak)
I frequently use flash to completely avoid Zed's deathmark. He can't follow up unless he uses Living Shadow, and you can juke and avoid the living shadow if you're careful. I also frequently see other people trying to do the same thing as me. ...and then finding out that, similar to Vi's ult, it follows your flash and lands at the end.
Vi's ult stuns so it's easier there(skills like flash can be queued if you use it just before the end of CC). Zed ult should stop tracking someone 0.1-0.2 seconds before he finishes his dash, however. There's still plenty of play involved in juking the followup Living Shadow blink.
SUMMARY: Removing Zed's dash/blink tracking for the last split-second of his ult would make it easier to learn to fight him, while (I think) resulting in very little impact on professional play.