I've always understood that the rudder issue, only became an issue on a 3 engine stall, when it went into an uncontrollable spin.
I remember reading about it years ago somewhere.
So in these pics, providing the aircraft is above the stall, it isn't an issue.
I have never flown a 4 engine piston, but on a light twin, plenty of rudder was needed to keep it straight and level with one engine out.
Last edited by rolling20; 4th Jan 2021 at 12:37.