If BS died and HS lived then his entire estate would be held in trust. So Yes, there was a point in killing her.
Slain billionaire Barry Sherman's will divided estate equally among four children
"Sherman also laid out instructions in the event that he died before his wife.
In that case,
he asked that trustees hold his entire estate in trust and pay “the net annual income derived therefrom” to Honey Sherman “in quarterly installments.
He also gives his trustees “absolute and unfettered discretion” to provide Honey Sherman with additional payments from his estate to provide for her “comfortable maintenance and benefit” as they deem fit.
Interestingly, Sherman does not direct that any portion of his estate be donated to charity and instead states that his
four children - Lauren, Jonathon, Alexandra and Kaelen - would split it evenly upon Honey’s death."
Also:
Unsealed estate files reveal Barry and Honey Sherman's plans for their fortune | National Post
"Upon their deaths, Barry Sherman held $67 million in personal property and $1.8 million in real estate. Honey Sherman had $45.9 million in personal property and $9.5 million in real estate, the documents say. This figure covered by the estate files, though, represents a fraction of their true wealth;"