Makai already gave it.
On this note, no he shouldn't because that's not what happened.
Excalibur took on all the energy even before Arthur had actually been resurrected, and channelling said energy isn't really even a feat of power. The energy was used to unlock Lake Salisbury,
resurrect and awaken Arthur.
The only reason Chaos (not Arthur physically) scales to the lake combo is because Lady of the Lake was wrought from Chaos.
Given that Zeldris is still weaker than Behemoth and 50% DK, I seriously doubt that Meliodas got 4,000 x stronger in that same period.