There's no bullet proof way. Different people will do different thing, some people will be loyal to the end of time, others not so much. Sometimes not even i

There's no bullet proof way. Different people will do different thing, some people will be loyal to the end of time, others not so much. Sometimes not even in a pre calculated way, people go in thinking they will be super loyal, then something shifts, and they do things that undermine you. Also very hard when people strategize against you, there's no full proof way of doing things, just a lot of guidance to avoid known problems. History is full of stories of betrayal by inner circles... so you are not alone, just somewhat wiser to the nature of the beast