It occurs to me....If Charlie has the ability to kill Stanley unless Jillian is left alive, wouldn't he still have the ability if Jillian is left alive? If does so, the only difference in the end result would be that he still has Jillian as an asset. He may expecting that to stop/trivialize Parson as well, which is why he's willing to pay so much (in funds and calculations) to get to that point. And that's without considering whether Charlie could reclaim the monetary portion from GK's capital after Stanley's dead.