The Dantes would usually never involve themselves with another company, but they were also smart enough to recognize fresh meat dangling in front of their face like this. They knew that it would be stupid to just allow the company to go to Mark Vanitas when they could take over and reap even more benefits from it.
So, the Dantes sent their eldest son, Sinclair, into the company. Sinclair had only one mission. Bring as many shareholders as possible over to his side and make them appoint him as the next CEO instead of Mark. If Sinclair becomes the next CEO, then taking over the company from the inside would become a piece of cake for the Dantes!
Sinclair was a brilliant man who made his decisions based on a massive amount of accumulated data and intense initial contemplation. His mind worked like a V12 engine at all times, calculating and parsing any information that reached him before using it in a way that would be beneficial to him and his family.
