The Sinner scales to most of the higher-ups, so I think it wouldn't be too derailing if this became his downgrade/coffin.
(Mostly copy pasted from my response in a previous thread).
After King made The Original Demon bleed from the mouth, he stops the spear with his shoulder
[1] [2]. Although King could have used up magic power depending on translation (one says changing form from long distance is taxing, one says using it over long distance in general does), and Zeldris did feel the need to stop him from getting hit by King's blast, but this seemed to be very powerful, and Zel used God rather than his own power.
The Original Demon is certainly stronger than Ludoshel in Margaret's body, as A) he's the combination of Chandler and Cusack, B) popped the darkness shield created by 5-C Meliodas that Margaret/Ludo could only penetrate with an Ark forcefield
[3] [4] [5] [6], C) Merlin stated that any chance she, Escanor, and Ludo had was lost
[7], and D) He withstands a massive attack from Ludo's true body.
Also, when Escanor and TOG clashed, the latter was obviously very casual
[8] [9] [10] and slices through his chest like paper
[11]. It's clear he can easily stomp Escanor because he does just that.
