This battle is a cursed battle, btw
Meliodas is higher that 220+ gigatons feat of creating an ocean by an archangel
While Natsu is higher than 500gigatons of Irene feat
In previous thread, many ppl say and accept that after meal full counter Natsu flame, it's not Natsu flame anymore
here So natsu can easily consume them and powerup
AM meliodas love to use hellfire which can be good food for Natsu, and he will gain those flame power.
Meliodas Regenerationn is limited so after a long battle, his Regenerationn is not going to be a problem for Natsu since meliodas Regenerationn is based on stamina. And not forget that Natsu have good sensing, attack prediction with his dragon sense, AM never shown to be use revenge counter and it's very unlikely for him to do that since he needs to let himself open and absorb damage.
With good ap advantage,fire absorption+static amplification Natsu can take it mid difficulty
If anyone says FC still work then
-Natsu is immune to his own flame so fc can't do anything
-even if it do something natsu can battle like this(look at this
sca)