24K huh? A rather high estimation IMO. You think she could be that strong at full power or when she is in a host? When I say tank I don't make a difference between physical and magical attacks. Meliodas and Demons in general proved that they are very durable. We don't know what is Zeldris's power exaclty, that's exactly why it should not be considered here when all he did was take a surprise attack.We don't know her level. (It could be 24,000 with most of that devoted to magic.) And he's a physical tank. Arc is natural dangerous against demons without strong enough darkness. Also she said the compatibility was good. We don't know what the power the DK gave zeldris does fully.
That's why I am talking about vulnerability to Ark depending on the Demon. And if it really exists then so far:Derrierie was at 50+ k when an Elizabeth who wasn't aware she could actually attack others with her powers pulverized her hand.
Jelamet probably knows how to do that, Mel was only at 32k, we don't know how strong Jelamet is compared to Ellie when she did that to Derr etc etc
There's always been more factors to these things than just power
Zeldris/Estarossa> Meliodas>> Derrierie.