Thanks but no

"Wow!" Mr. Z exclaimed.
They do know that he is doing something good.

Mr. GM called him and asked him is there anything that he could do to make him stay. Smarty Mr. GM even offered him some flexibility for him to consider coming back.
Later Mr. RM spoke to him and offered him again to make him stay.

Well, that's really too much. Too much of recognition, kindness, caring and smartness.

But Mr. GM also mentioned that his decision might not be that bad after all. "Taking over family business and working for yourself don’t sound bad at all", he added.

This surely motivated Mr. Z because now he knows his effort has been recognized, by somehow, by somebody.
But his answer to them was,

"Thank you so much but I have to say no"