Point 3 is rubbish, we are literally never folding this unless we have some amazing read (which we won't have).

If MP guy is incredibly nitty hands that have us beat which are in his range are AdQd and AdTd, and even someone who is massively nitty is betting his sets in that situation and I'd be very surprised if he wasn't betting at least AA too. Even if he is only betting 77 in that situation we have >50% equity.