Kayn's passive is responsible for unhealthy play patterns
Well to start Kayn being not quite finished at game's start is a big deal as a jungle pick, I feel pretty okay fighting a Lee or J4 or Zac on even grounds once I've become either SA or Rhaast, but I'm doing nearly 25% more damage as SA and have big sustain as Rhaast. I've spent this past week either playing Kayn or invading Kayn and generally invading him just feels great. Not like base Kayn can stand and fight Kha or Elise, Even Mao'kai or Skarner or Sion. Quinn is particularly bad for him to run into and Kayn is on the short list of junglers I have no problem contesting for first mark as Kindred (honestly that's a pretty serious offense, Nearly everyone can bully Kin of their first scuttle)
But more than that I'm concerned about How people play Kayn. Those that didn't play him on the PBE were introduced him literally with a warning "Transform too late and you'll be behind" And it's true: the best games I've played and seen involved earlier than normal Transformations and the worst were what could've been slightly late Transformations that became 'much too late' due to Kayn having to wait out the timer for his desired form, the form his team needs and expects to perform an important job (because everyone's job in league is important to the team). And this trend is causing players to not take the time to gank lanes that would charge the 'wrong' form. When playing Kayn I suggest players ban Gnar if they want to be Rhaast, cause a good Gnar will push top in, and if they realize you're hesitant to gank them thanks to their status as a ranged champ your top laner wont be happy. Mid lane is a regular hotspot for many Junglers, snowballing the team's second best roaming influence is appealing, but if you set up a tent and roast marshmallows on that Malz you'll end up either picking assassin into Malz(who doesn't love diving a back line with a malz suppress in it?) Or waiting it out. It's no Secret bot is often a focal point early game, thanks to the power a snowballed ADC gives as well as Dragon's being cool. Yet I've seen several Kayn players Forgo that to frantically seek out the enemy jungler and force excessive plays top in the name of relentlessly pursuing Rhaast.