Worst comes to worst, rito nerfs his numbers slightly. He's probably edging the op line, but he's certainly well above viable. Even if they hit some of his base numbers on q, the reason he scales well into mid game, or w, one of the reasons he scales into late game, he'll still be strong barring a full defanging. Which hasn't happened since pre-rework eve.
Right now, he's a safe main. Not so overtly strong to garner patch attention, but strong enough to make an impact.