He won’t gain on the debt, because it’s an interest free loan. Even if he recalls it, it will basically be the money he put in.
He will most likely gain on the shares, but only if the club is successful. He won’t gain if he “destroys” us, as you put it, because why would anyone buy a club off him that is in ruins?
Your argument that he wants to profit from us and ruin us don’t really run in parallel, because profit comes with success (to a point) and sustainability - he knows that’s what we need to achieve.
Whether he’s capable or not is another question.