My guess is that hillary was involved way past her cankles. I think 0bama and hillary were planning to blame US gun owners and would do an international treaty with Mexico to outlaw US gun ownership.
Holder and Obama were openly begging Mexico to sue the gun companies in US courts.
And I frankly think there was more behind the scenes; they were colluding with one cartel to take down others, to the point of letting their shipments go through and arming them.
And don't forget there was a parallel program running guns into Honduras. This was about the time they were backing a rogue would-be dictator there.