I am inclined to agree with this.
Ozzy said as much himself in the infamous interview from Decline of Western Civilisation, that Sharon's intervention as band manager spoke for itself.
The band were so caught up in drugs and fame, they were an easy target for unscrupulous industry players to rip off. A familiar story from many bands of the time with young members barely out of school suddenly making millions in an environment that would make anyone's head spin.
She made unpopular decisions with her head not her heart that ultimately protected the band's interests - and she stood by those decisions no matter what. The mark of any successful business (wo)man.
You might also be interested to know that a few years ago, I was employed in a business that took us in and out of the Osborne's home in Buckinghamshire.
Ozzy and Sharon's bedroom has two ensuite bathrooms - one for her and a seperate one for him. I expect that insisting on not sharing a bathroom with Ozzy is part of the glue that holds the Osbournes together!