I
nfinity is called bordering cheating and not normal magic by Greyroad and Fraudri, it is also described as
so unfair here. This is also
the Description. Infinity is clearly hax magic, they even pretty much say so. The type of magic she also use is not based on conventional durability,
it's a whirlwind, which she used to
trap her. Merlin also captured Grayroad after she split into multiple parts.
Merlin is clearly stronger, firstly
her experiment ray wrecked Grayroad, and is specifically described as
very dangerous by her. Merlin was literally fodder stomped by Galand, yet she manages to beat an even more powerful enemy after,
then freezes Cusack.
Saying she had no way to increase her power is headcanon, and doesn't matter. Power scaling doesn't care about plot. Merlin was consistently below all the 10 Commandments, and Albion before, now she's above most after.
Gowther at the time of the escanor fight hadn't awakened (it's literally shown when they say he has a 3100 PL), but that's irrelevant because he never fought Escanor at his
29000 pl. Gowther was stomped, and surprised that he was still alive by the end of it, using Mind-HAX to win.
Also Meliodas says he had to wait for a window of opportunity before fighting Drole and Gloxina, or he would die. He then goes Demon the instant a full power Gloxina appears. So Meliodas isn't anywhere near these two 50 - 40 K power levels with his 32.5 K PL.
EDIT:
Here's the exact scan.
The Fraudrin one doesn't even matter since he withstood hits from Meliodas with a 30k Power Level. Meliodas with a power level of 4400 and 10,300 couldn't even hurt a weakened Galand (26,000). It's non sense for a 3,100 PL to even fight a 31,000 PL. More proof is that the 3,320 Meliodas with Liz's sword barely cut the 5,500 Albion.