Roman is hopelessly tone-deaf and completely incompetent to lead a company like 3M.
Inge put him in so he would look good in comparison.
Monish has the GE gameplan. GE methods are well known in 3M and in general in the business world.
GE gameplan is great at optimizing a good business.
GE gameplan is Terrible at keeping it a good business - R&D, customers, morale
McNerney was brought into a company that needed to optimize. He changed the culture with his disciples Sauer, Roman, Thulin.
Monish is very competent to do what he was brought in to do.
And he is a true believer in the GE gameplan.
It's just the wrong gameplan.
So Roman is much worse - He put Monish in.
Can't blame Monish for being Competent but executing the totally wrong gameplan agreed to with Roman and the Board.
They really have to get rid of both of them.