According to your description flashy is the fastest amon all s class heroes But according to me,Blast is the fastest because he easily dodged flashy flash's attack.
I think the fact the Metal Bat is stronger than WatchDog Man is cap, because Metal bat almost died to Garou while WatchDog Man neg diffs garou unharmed
beef cake's height is hard to determine but i feel like the narrative of his size was concentrated based off on the footprint scene to show the actual scale on how big he really is. I used google map as reference as close as possible and his foot print is about 1.25 miles long which makes him approximately 15000 meters tall