Aren't dosu-yukkuris upwards of 3 meters tall? Huge ones (anomalous ones, at least) could then be ~7 meters tall. Thankfully, size does not protect their batter from the fire.
Also, this picture is very cute. Sure, accessory abuse, burn-crippling koyukkuris and all that stuff is hilarious, but once in a while pure cuteness is just plain and simply good.