Is the Marine Corps standard for reliefs of colonels different from that for generals?

A
friend writes that he "smells a rat" in the recent relief of the commander of
the Marine Officer Candidate School at Quantico, Virginia. 

"You are responsible for what goes on inside your
unit," the Marine commandant said in explaining the removal of Col. Stillings.
"Period."

Oh? wonders my friend.
If that is the standard, he notes, it begs the question of why there has not
been a Marine general relieved in many moons. On General Amos' watch as
commandant, he observes, "the Marine Corps has seen Marines
urinating on Taliban bodies, scout snipers posing with an SS flag, a sexual
assault pandemic that the Commandant himself has described as ‘incompatible with our core values of honor, courage and commitment,'
rising suicide rates, the catastrophic Camp Bastion attack, and
the hazing-cum-suicide of Lance Corporal Harry Lew." So, he asks, "If 2.5 bad
happenings were enough to soul-crush Colonel Stillings, what is the magic
number which would cause a service chief to resign?"