I support quotes, and Sidious is obviously the greatest DLOTS, but I think I see what HWKA is trying to say here:
If you give... Lumiya a stick, and say... Rosh Penin (random Jedi) a lightsaber, and that is ALL the equipment Lumiya has, she is probably going to die. Not necessarily, but her chances don't look good.
This doesn't necessarily make Rosh Penin a greater combatant than Lumiya, in fact, most would argue differently. It just means Lumiya was severely at a disadvantage in this fight.
In a fight in which Lumiya has the exact same equipment as Rosh Penin, she is going to win the huge majority of the fights. She is more powerful. However, if she starts at an equipment disadvantage, there is a chance she will lose.
I think HWKA is simply stating here that he thinks Sidious is at an equipment disadvantage. He is stronger in the force than Bane, and a better duelist than Bane, but perhaps so was Raskt'a, and it didn't do him much good. According to HWKA, simply because Sidious is more powerful than Bane, it doesn't make it a cut and dried argument over who wins a duel if Bane is wearing the orbies.
Personally, I think Sidious would fry Bane's orbalisks, and end the fight with UNLIMITED POWaaaah... but HWKA exaggerated a point to the extent that he lost his point in his example, but I think the point was a valid opinion, even as I believe it is wrong.