Make it so that allies can't see who Rengar is hunting

Currently on live when Rengar ults, he'll alert the nearest person within range to the fact that he's in ultimate. I don't like the fact that a stealth Assassin literally announces that he's coming (especially when Twitch has better stealth than Rengar..), but I get why Riot opted for such a change. What I don't agree with however is the fact that on live, not only can the closest target see that he's the nearest potential victim, but his entire team can see that he's marked too. I think only the marked person should be able to see that they're marked, and after that it's up to them to either run to their team for help, or spam ping their team that Rengo is incoming. Of course, if Rengar changes who the nearest target is (let's say a tank was the nearest target at first, but he loops around so that a squishy is now the nearest target) the Tank/Support w.e could also guess figure out who Rengar's chosen target really is. Making Rengar's positioning both during, and before casting ultimate even more important.

This would also add to the theme of being hunted, I feel, as Rengar would be able to continuously switch who the target is to confuse enemies. Is he still after us? Did he back off? So he's not coming for me? Etc etc.

This would promote teamplay as a counter to Rengar, but also make it so that Rengar has a way to psychologically mess with his targets and essentially juke into favourable position through correct management of aggro.

Also, currently on live, if there's a group of people clumped they can literally figure out what direction you're in due to how the fact that everyone can see who's currently marked. This feels unfair to play as considering Twitch has a resettable stealth with a lower detection radius and the ability to attack from further with power that can erase entire teams on a relatively low CD basic ability that gives the enemy team absolutely no warning...