Jhin might not have killed Zed, Vi, Sona and Garen but instead releasing power in them.

Perhaps it was Jhin Empowering Zed, Vi, Sona and Garen with more power! Think about it, Power comes from beauty and it makes sense for Jhin to have the ability to RELEASE the power from those champs!

I noticed in the video "Mind of the Virtuoso" the first girl shown in the video was most likely shot in the chest, therefore the bullets coming out through her back. (But her hand was covering her chest so I thought it might have shot her hand first and that kinda seemed strange.) The flowers that BLOSSOMED (connect it to Zed) could meant that her powers were Blossoming/growing.

(Zed btw had the flowers blossoming from under his mask, perhaps it means his powers are being released? being free of this mask would unleash his powers?)

I know how the first man and the second girl seems like their souls was being released when they was "shot" but it also could be the releasing of burdens/sins?

(Sona in her teaser had bit of breath flowing from her mouth and what seemed to be also shot in the throat could be like burdens of being a mute is forever gone, Look, she would be sooo OP if she can play out of this world music and at the same time sing on the same level)

the last man was shpt and rose up with a tree, it could be his powers rising up to new levels.

(Garen on the other hand might be shot in the heart to be released from his sins and perhaps lust in order to achieve higher power, it seemed like the only thing that held him back was "love" cause if he never fell in love with Katarina, he would have killed her in a heartbeat.)

(Vi was shot in the arms and released from her mecha hands (note how in her teaser her hands are glowing which might mean that Jhin gave her powers to no longer need the mecha hands to protect) thus releasing a burden/fear of being powerless?)

IDK boys, It is just a theory and please tell me what you think. I think Jhin is an ADC who is like a ADC Sona who provides a crap ton of buffs to his team. It would seem like what Riot wants to add an new mechanic to the game in order promote a less selfish ADC mentality to the game.