"most responsibility for" is correct and can be used in written English.
You can use it when you are referring to a normally singular responsibility that is shared by multiple people or entities. Example: The company and the government both have to share most responsibility for the current economic crisis.
Having watched the play the night before, I caught up with Pierce an hour before Brother's penultimate showing to share notes and thoughts about art as activism; who bears the most responsibility for the poor governmental response during Katrina; challenging the city and country's confederate history; and his hopes/fears for New Orleans going forward.
Typically, OPEC bears most responsibility for oil-price increases.
Two people bear most responsibility for his eclipse: John Berger and Clark's son Alan.
Who, then, bears the most responsibility for gridlock in the Senate?
Together they must bear most responsibility for the deterioration of nature.
"The people who are standing trial are not those who hold the most responsibility for the spill," Mr. Sánchez argued.
The Department for Children, Schools and Families (DCSF) inherits most responsibilities for under-19s, including some taken over from other departments, such as youth justice and the "Respect agenda" (cracking down on anti-social behaviour) from the Home Office.
Our results lend support to our exploratory third hypothesis; high criticism carers made most responsibility attributions for events and high EOI carers fewest, even fewer than low EE carers.
"It puts what matters most -- student achievement -- front and center as the most important responsibility for a teacher".
In most companies, responsibility for cash management rests mainly in the head office rather than at the divisional level.
But Dr. Alan Wasserman, who is Dr. Malakoff's immediate supervisor and had the most direct responsibility for monitoring his care, said he was unaware of the Internet purchases.
