He's written as the third option as executor of the estate. And I think you know that just means that he signs papers for the lawyers who are the ones actually making sure the will is executed. That lawyer is likely Phil Wittmann and Loomis is no more like an owner than Phil Wittmann.
Lauscha is the real power behind the throne and Tom taught Gayle to be ruthless in business. If Mickey starts costing them money, he's gone.