Both groups of rats became addicted at the same rate. This was not reported in the MSM.
Sure, that's plausible. Heroin is highly addictive.
But, as I said in my post, that has nothing to do with the gateway theory. As correctly stated by the author, it is "the claim that marijuana use leads to harder drugs". The theory says that pot users are more likely to try other drugs, including harder drugs.
And if a higher percentage of pot smokers (vs. carrot eaters or milk drinkers) try harder drugs, that will naturally result in a higher number addicted, even if the addiction rate is the same.