Months before the murders,Jeremy and AE had had a blazing row over Vaulty Manor,which was owned by the Speakmans,which the Eatons had wanted to buy. Jeremy,however,put paid to that thought by saying that his father intended to buy the place himself.
This was when AE stormed into a rage and tore the wallpaper in the toilet at WHF.
Would Jeremy have thrown all that away ? Of course he wouldn't. Neville's intention would have created the fireworks which Jeremy would have delighted in seeing,plus the extra revenue which that would have collated.