Even the most "dangerous" steroid still doesn't belong on the controlled substance list. I think marijuana and steroids are the only drugs on the CS list that no one has ever overdosed. And for all practical purposes, it is impossible to OD on these two drugs.
I've read that the lethal dose (LD50) for mibolerone in rats (i.e. the dose required to kill half the population that took the dose) is 1,600,000 mcg/kg.
So, if it were possible to extrapolate the rat data to humans, it would mean that "the most dangerous steroid to date" would require the theoretical consumption of 29,000 bottles of Checque drops within 15 minutes to achieve the median lethal dose for a group of 220lb bodybuilders!
Of course, the dangers from mibolerone (as with other orally active androgens) are the result of chronic use and not acute use.