” The first will is valid on its face, the second is going to require legal legerdemain that costs real money to get a judge to declare it valid.”
Less money than if the women contest the signed will and sue the executer for hiding the unsigned will.
Again, that all takes real money, upfront, with no guarantee of winning.
And there's no chance he'll be sued if he makes the choice to ignore the terms of the signed and witnessed will where he was named as executor?