I 'm not really convinced he's fast enough to tag Marisa. You cited earlier that "Miracleman does stuff like casually rip out hearts and fly through people fast enough to make them explode. KM is explicitly described as way out of Miracleman's league". But you can be several orders of magnitude slower than the speed of light and still be able to do things like that. I'm not even sure you need to go much higher a few hundred times the speed of sound to do that.
You also said that their fight is "described as flattening what was left of London in a few seconds". How much of London is left? Couldn't this be more due to the power of the attacks rather than speed? If their attacks are leveling several dozen city blocks at a time, leveling a city should be a fairly quick job.
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SuperNiceDog was not so nice to my bracket.
Congrats to SuperNiceDog for winning the Rivalry Rumble Guru Contest!