@Yomi - you make good points, but I'm going to try and see if I can negate them.
1) I'm not sure how hot Escanor's flames must be, however, melting stone and metals are feats that are applied by hot yellow flames (being at around 1,570 degrees celcius at most to melt iron or steel).
2) If we're going by statistics, Doflamingo is much more powerful than Galan. I concede that Escanor, near or at his peak, would be capable of soldiering through his attacks, but taking no damage? I don't see that being the case. Attacks like Flap-thread should be capable of holding Escanor back, if even somewhat.
3) The links to your images are broken Q-Q, but a PL of 4,890? Isn't that incredibly low?
4) Doflamingo's attacks would still be able to do something to Escanor, even at his peak. You're comparing a High 7-A character to a 6-C character, and while it makes little difference at the boarder, Doflamingo should be physically far superior to Galan.
5) iirc, Estarossa's commandment negates attacks that are fueled by anger, or hate. He dispelled Revenge Counter with his commandment by being the closest target to it, while Meliodas was full of hate and trying to cut them down. And of course, Doflamingo would be at a physical disadvantage against Escanor, but he still has his awakened powers, parasito, pseudo-Regenerationn, and precognition to help him against a fighter that is stronger than him.
6) He took the full counter slash, but he was clearly injured by it and was shaking. As soon as the clock hit 11:30, his power increased drastically, allowing him to overpower Estarossa.
7) I do not see Doflamingo's threads or himself being incinerated by Escanor's heat. Doflamingo seems to have some sort of resistance due to heat and cold due to his superhuman body, and also due to haki. He blocked Sanji's Diable Jambe with his leg, which was not imbued with haki. He didn't show any signs of being hurt by it. Pre time-skip, Sanji's diable jambe was capable of scorching Jyabura from his skin through his ribs despite Tekkai being activated.
Doflamingo didn't even flinch from the heat. I'm not saying that Escanor would be unable to burn Doflamingo, but I just don't see him being capable of incinerating Doflamingo or his threads with his current feats. Armament haki also helps in this case, as it places armor over the user, and his weapons/ability.
I think that you guys are mainly focused on this fight being almost a brawl for the entire duration, but Doflamingo could fight extremely passive, or even trick Escanor into fighting just his Black Knight while the real one hides out of view for the fight.
Even though Escanor becomes stronger and stronger up until Noon, he does not lose the damage dealt to him. And if Doflamingo retreats into the sky and Escanor tries to follow him up there by jumping, he will be wide open for an attack, or being immobilized by threads.
Escanor's miniature sun can be caught by Doflamingo's Break White applied with haki, if only for a moment, and Escanor's attacks are mostly melee. Doflamingo would not have a hard time steering clear from his attacks via evasion, or even using his ability to throw Escanor off balance (Everwhite changing the floor into threads, Black Knight keeping Escanor off of Doflamingo himself, and even using Spider thread to catch Escanor from point-blank range).
Even if Doflamingo takes blows from Escanor, he is durable enough to survive them. He even survived having Gamma exposed to his internal organs, and got right back up a moment later and continued fighting.
While Escanor has a better chance of coming out victorious with his superior power towards Noon, once the sun starts going down, he will gradually weaken. Doflamingo is one of the characters with insane stamina and could probably hold his own against Escanor for hours. Once Escanor is weakened to a point where Doflamingo is physically superior to him, it would be his victory.
(This is why I wanted you to make the thread... i can't vote, but you can *cries*)