A question about yasuo..

Please put down your pitch forks as this isn't a "buff yasuo thread" or "omg yas so op nerf plz ty rito" Would it be possible to make it so that he doesn't get the bonus armor pen on everything he attacks after he ults? In other words.. I think it's silly that if i'm a tank and manage to get outta the way of a knock up(but the person next to me gets hit) that it was now pointless for me to have possibly flashed out of the way of said knock up because he's going to get the bonus pen on me anyways(thanks to the ally that gets caught in the knock up).

How can we fix this? I believe we could fix this by making it so that "Last Breath"(yasuo's ulti) applies a mark to all targets that it hits and grants yasuo his bonus armor pen specifically against those targets. If this is considered a nerf and needs compensation then maybe we can up the armor pen and or increase the duration of said armor pen. The ability description may looks something like this

Last Breath - Active: Yasuo blinks to the nearest visible Airborne icon airborne enemy champion to the cursor, instantly generating maximum Flow. Upon arriving, he suspends all nearby airborne enemies for 1 second, marks them with Bushido's Vengeance(or another name if you've got a better one) and deals them physical damage. For the next 15 seconds, Yasuo ignores 50% of his targets' bonus armor if they are marked with Bushido's Vengeance. Casting Last Breath clears all stacks of Empowered Steel Tempest Gathering Storm.

That's just a rough idea of what I think could be done.. as I said it's not supposed to be an omg nerf and if a compensation buff were needed that's always possible as well(we'd have to see anyways depending on what they decide to do with warlord's bloodlust in the future/keystones in general). Alright welp I've blabbered enough for now, so feel free to let me know what you think! :)

EDIT: Not sure exactly why this started getting downvotes.. If you're going to downvote please at least state your reason, thanks for your time :)