Big leaders have been following since the beginning of EPN's term. I think the first was the death of El Lazca.
He is beholden to the grupo atlacomulco and they have ordered him to clean up Mexico's foreign image by arresting prominent criminal leaders. They're primary focus is the privatization of Pemex and this requires foreign investment. They fear Mexico's image of lawlessness with hinder their pitch to multinational corporations.
They were fine with sharing the spoils with the cartels, but now the oligarchs want it all for themselves.
Those that say, don't know. Those that know, don't say.