Kay/O in his current state is around the same viability as yoru. Checking valorbuff or blitz they both sit around 43-47% winrate. Everyone knows yoru is bad but not nearly enough people say kay/o is bad. People keep making the argument that people haven't figured kay/o out despite the fact hes been out for almost 3 months now nearing the end of the act or they say hes strong due to having a similar effect to breach where both are annoying and have aoe that is hard to dodge but ends up just stalling for a few seconds.

Kay/o's knife is almost never used for suppression since even if you suppress someone they still have a gun and require a team cord to work and is almost exclusively used for the info. I'd argue that sova's info is far better since you can play off knowing where enemies are and get wall hacks but that doesn't work nearly as well for kay/o since you have to work off knowing a general area.

Kay/o's flashes on release were compared to cs however they have a very glaring difference. Kay/o's flashes make a fuse sound throughout the deployment of the flash whereas a cs flash only makes a sound if it comes into contact with a surface. This makes kay/o almost equally as noisy as yoru since the radius where you can hear the flash from is quite big and can let you track kay/o. On top of that kay/o flashes are arguably the hardest flashes to use in the benefit of your team. Due to a fixed fuse, its very difficult to time properly to get a good flash combo. I can almost guarantee most players have been flashes more by a teammate kay/o flashing behind him to pop flash than an enemy kay/o.

Kay/o's moli is very underwhelming. Its sole purpose is to clear out corners but it lacks a lot of versatility that other molis do. Due to it having such a short active time it can't really be used to stall anything. The speed of the molly also hurts it a lot. Unlike kj his molly is kay/o molly used more offensively whereas kj doesn't care about the speed of the molly due to how many uses her molly has. Kj can use her molly to stall loads of things, her molly works through the floor, she gets 2 so wasting a molly isnt nearly as painful and kj is a sentinel so she has more time to set up mollies whereas kay/o has to do it on the fly.

Kay/O's ult is very detrimental to kay'o himself. People were complaining about kay/o having a stim on top of huge aoe and the res but this ends up hurting kay/o a lot more. Kay/o, unlike Reyna, has no way of gap-closing so he has to use his stim in a lot of longer-range engagements with a spray pattern that is harder to control, and since ulting kay/o is most likely the first entry due to how his ult works he'll end up dying a lot of times. Even with res kay/o will die 9 times outta 10 due to a lot of factors. Kay/O has no control over his res and has to rely on his teammates. This either leaves to you dying due to being left behind and no one ressing you, dying since your teammates didn't cover the res properly, or both you and your teammate dying since you're probably in los of an enemy. Sage res works since sage has ways of covering the res and phoenix just needs his team to watch his ult spot. Kay/o has neither of these aspects and the only saving grace of the ult is the aoe since its the strongest anti-sentinel ult.

My ideas for buff for right now is to

-give a second molly

-decrease the sound on his flash

-allow him to crawl while down so he's down

-decreasing the power of the stim to make it more manageable for the kinds of fights kay/o takes

these are a few ideas to buff him but not buff all at once

tldr:kay/o has very underwhelming kit that ends up being more harmful to himself and his team than the enemies. He doesn't fit into any special role since his kit is duelist/initiator but is subpar in both aspects and doesn't have a defining role to play like jack of all trades like skye or info like sova.