Yeah but you forget that Hunter fest, which he used against Galan, doesn't allow him to take in all the power of his opponent, or else his own body will be harmed.Mera explained this, so if Ban had a hard time taking Galan's power then you can bet it will be more difficult for Dolor particularily and Gloxinia. I only see Dolor as stronger than Galan.
That's prolly accurate, the commandment bit, so whoever breaks the rule of repose will get incapacitated in some way.However so far it doesn't look like Gloxinia stated anything about what happens to those who lose. It might even be that they get their soul sucked away, which I believe was their intention in the beginning, to gather souls. So either way I can see those who lose not being able to interfere with future fights.
We can't be sure of anything when it comes to Escanor, sure it looks like his team is the weakest, but since his soul doesn't get ingested either way, there's not much to fear. I hope that if he loses he gets knocked out for a while, that way he won't try to interfere in the future fights which could have him break Gloxinia's commandment. So while he's knocked out he could be able to transform later on in his day form.
And overall it would be bad if some of the sins fell for the demons commandments, since their effects seem permanent. We don't know if Merlin recovered her body, and frankly it would be too much if more than one sin was in her situation.