So now that the lore has been released I now see how 
is involved but what about 
, 
, and 
!!!!!! This has left me empty and wondering.... longing for more story!!! GIVE ME MORE STORY!!!!!!! ....Please??.... I'm begging here!
ModWulf Helhammer6 votesGaren, Vi, and Sona were chosen for artistic reasons -- they looked good in the teasers. This isn't to say that Jhin hasn't been planing "performances" for them.
There's a red response to this on Reddit, should be linked on S@20 if you want to see it
Jeddy0172 votesIn other words,it was just teasing for the sake of teasing with no lore implication beside showing how Jhin looks at his....."artwork".It could have been any 4 champ that are susceptible to gun fire.
GreenLore2 votesThis was asked already several times and even before jhins lore was released,they clarified that these 4 are merely people that jhin knows(he probably heard of garen,Sona and VI while working outside doing some assassinations) and it shows how he'd imagine their deaths.
Overall these 4 were mostly chosen based for artistic reasons and not for lore-related reasons.
James Stone4 votesThis was asked already several times and even before jhins lore was released,they clarified that these 4 are merely people that jhin knows(he probably heard of garen,Sona and VI while working outside doing some assassinations) and it shows how he'd imagine their deaths.
Overall these 4 were mostly chosen based for artistic reasons and not for lore-related reasons.
So, essentially, a whole lot of flair and pretty things with no actual substance, meant only to fill space between gameplay releases and hype up a new champion/event, devoid of meaning and fullfilment?
Everything we've come to expect from the lore team then, with some exceptions.
SimplyStephi3 votesI really miss the earlier lores like back when the "Institution of War" existed and everyone was somewhat tied together in a way.
Blue Moon Wolf1 votesnot everyone, quite a few champs got shafted on the lore even then. Especially a certain champ based of a public domain character that more or less got tacked on to 
's lore >_>
SchaakaKon2 votesHave to say, I called it back when the teasers were first floating around. Same thing happened with Kalista (the fog around champs) which ended up being alot of hype to nothing.
Sona, Garen, Vi and Zed were chosen because they are popular (could you imagine if in Jhins teaser he was shooting Malzahar and Galio?). Zed just so happened to be lore related.
GreenLore1 votesWell at least in Kalistas case it did give us the hint that she is out to hunt betrayers and also forshadowed that Hecarim betrayed someone in the past.
TzQGRUST391 votesThe Jhin teasers are way worse offenders than Kalista's. In Kalista's teasers it showed who could possibly be targeted by Kalista. In the Jhin teasers it straight shows them being killed.