tank ekko does damage because of his passive

it's literally entirely his passive. you look at death recap, and you see his q and e dealing like 5% both, and Z-drive resonance dealing 90% of your health. also, the movement speed buff is cancer. the missing health damage on his W is a factor in his damage, but his passive is the largest contributor. can we like, rework his passive entirely so he's actually built like an assassin like he's supposed to be?