Yoda tenacity up and then chirruts special (I hate his name I always spell it incorrectly) can one shot a few toons.
I have also seen Kylo hit 72k on a single hit from his attack which would one shot quite a few characters in the game. (This takes no setting up on your part, just being attacked)
I'm not talking about the very first turn of a match I'm saying no toon should be able to one shot anyone unless it is a special on cooldown like DN.
Video for Kylo hitting 72k in chirrut in arena below;
https://youtu.be/rb8p9717uAk
To say they can't do it on the very first turn of the match is completely irrelevant, Rey never could do that as she needs buffs to increase her attack power!, they still introduced the protection in order to stop characters from being able to one shot another character, the video above shows that isn't the case anymore!
***i realise this video is a few months old but it is a good example of what I am talking about regarding attacks like this