Morde needs a followup rework

I don't normally write complaining threads, as more often than not I am in the wrong. However, last game a mordekaiser somehow got through the ban phase. He pushed top, and our renekton, heimer, and myself, lulu support, ganked him. He not only 1-shot renekton, despite being exhausted, but them proceeded to chase the rest of us down. Our caitlyn joined the fight, and he killed heimer, just wading through her damage. This was a 1/3/4 modekaiser with nothing but a cinderhulk and a rylies. Our team wasn't doing well, but the only one feeding was me. There is no reason a non-fed champion should be able to 1v4.