The schools were closed in Sonoyta after reports of shootings, until the state level guys found out and demanded they reopen !! It's Spring Break after all. Since they did not actually view the bodies they had no proof that anything had happened so they said it was an over reaction by those pesky locals, who have been ducking bullets..
Sonoyta was also the home base of Los Memos and their leader was broken out the Aguaruto jail with an elborate tunnel last year. He was called El Chapo's 'other' suegro, because his daughter was supposedly one of Chapo's favorite girlfriends.
It has been said that Macho Prieto was at war with other CDS groups in Sonora and that Los Salazars had tried to take Sonoyta from Los Memos but the son in law of El Señor Niebla was said to hold on until his escape.
Those that say, don't know. Those that know, don't say.
The only plaza that I believe Macho Prieto hold was Puerto Peñasco. He was in Mexicali and San Luis Colorado for a while as well, but I am not sure how much weight he really hold in those two last cities.
Puerto peñasco was checos plaza I believe macho Prieto was trying to recoup it for checo they both went MIA in 2010 and lost lots of ground out there when macho came back he took the garibays plaza san Luis.