Hmm. Using the phone virus, MC plants "missent" text from Silver's wife to Robert confirming the time of their tryst. Silver, being the devious shit he is, solves our Robert problem for us on the boat.
That leaves Silver for MC. While I can think of many bloody ends for him, another simple, but exquisite finish, would be to catch him attempting to date rape Christine. We get immediate satisfaction of mashing in his face, plus gratuitous pleasure of him (1) being jailed (2) being divorced (3) being sued and (4) losing all position and power.
Afterwards, the Mrs. Silver would, of course, want to make amends for the atrocities of her evil husband. In any way possible. Whatever Chris and MC think is equitable, for she is equally grateful for her newfound freedom and riches. Very grateful.