The key word there is “may”. 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.
Who is going to sue? Do the beneficiaries of the unsigned will have the $$$. Is the estate big enough to attract sharks?
It’s probably wise to gift the 2nd will beneficiaries to go away as recommended by the lawyer, but that’s up to the first set to decide.
” 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.