Possible Problem with Zed Ult Changes

So with Zed's new ult he gains flat AD plus a percentage of the AD of the person he kills with the most AD(current value I saw was 5+5% but I don't know how this scales since those numbers haven't been released). This obviously encourages Zed to kill the squishy adcs in order to get the most AD he can.

However, if the enemy adc is Jhin, who can easily get 700-800 AD in a match, and if Zed kills him (which he will because it is Zed vs Jhin), he will be given a free 40-45 AD, basically a BF sword plus change, just for a kill. This would make playing Jhin be so much more of a liability to your team because Zed's AD could increase by 20%-30% just from a single kill.

I myself am a Jhin main, and I don't want my favorite champ to seem like a negative aspect to my team because of this new ult passive on Zed.

What if instead, Zed was given the AD for a small amount of time (say like 30-40 seconds), so that it would be beneficial in teamfights when Zed initiates by ulting someone caught out, etc., and the bonus AD would help him out for the duration of the team fight, but not make him a massive snowball force that can't be stopped based on a single kill?

Just my thoughts on this match-up and new ult component. Let me know what you think!