@meddler: could zeds death mark mechanic work for garens villain mechanic?

with the assassin update, there was a mechanic added to zeds ult that allows him to "steal" ad from the target he assassinated with his ult. for that purpose the game is giving him an indicator to which target currently has the highest amount of ad on the enemy team and is the most juicy target to assassinate, and grab ad for his ult passive.

now im wondering, if the game could have the tech to dynamically calculate the highest damage threats on the enemy team. meaning the highest amount of sustained damage and/or burst damage. (based on champion stats like ad, ap, cdr, penetration etc... and ability damage).

if such a mechanic would be possible to implement in the game. maybe it would be possible for garens villain mechanic to always select the largest carry threat on the enemy team and mark him as the villain.

i see a lot of situational issues with such a mechanic. abilities like ult not always dealing the same amount of damage (either true damage or magic damage), or if the mark should dynamically switch in cases of abilities like passive triggering and fervor of battle, that can suddenly cause a massive spike in damage potential on an enemy.

still, my question is. given the efford. could it be done?