I think their major asset was the business. IMO BS would draw his wealth out of the profits, as he needed it, along with funds for the foundation that funded charities (which was probably managed to reduce taxes.)
I think it unlikely he, at some point, withdrew a few hundred milions from the business and put it to just sit in a bank account for his potential future use, nor would he be all that likely to invest in something other his own company.
My question is, would he have made a will leaving the business to Honey? I'm not sure that he would.
People do it all the time.
His wealth would not only come from profits but from equity.
He invested in his son's business, Frank D'Angelo, his brother in law and other business so it was in fact entirely likely.
I'm sure he had significant holdings outside of Apotex.