Anyways, all joking aside, I'll present my argument.
Obi Wan Kenobi is unquestionably the more skilled opponent, but Armstrong has feats of bullying more skilled opponents casually. And, yes, for the record, Raiden is more skilled than Kenobi. Any martial artist worth their salt can use a weightless weapon with enough practice. Raiden, meanwhile, was a dreaded one man army at the same age Kenobi was still doing basic blindfold tests.
However, I don't believe Armstrong can plow through Kenobi for one simple reason. Armstrong is a boisterous bruiser and an offensive dervish. Aka, he's the exact kind of enemy Kenobi fights all the time. Darth Maul, Savage Opress, General Grievous, and Anakin Skywalker. All overwhelming offensive forces who relentlessly hammered into Kenobi and Kenobi has still consistently been able to endure and outmaneuver.
He leads his enemy into unfavorable positions, exploits environmental advantages, and uses incredibly subtle tactics (IE. Parrying Grievous's wrists rather than his blades when he over extended himself and baiting Darth Maul into using a certain saber style by changing his stance, then exploiting the resulting opening).
Making matters worse, is that Armstrong has proven weak against these tactics. Remember when Sam cut off his hand? Kenobi's observant enough to notice that same weakpoint and more than willing to exploit it.
Then, you factor in force abilities. Sure, Kenobi can't blast Armstrong back with a push like he does with Grievous, but he can ragdoll him. Strength is relative when leverage is applied. If Armstrong is lifted into the air, he's not going to have anything to leverage his strength with and therefore, would be unable to escape Kenobi's grip.
Then there's ranged options. Anything Armstrong throws gets tossed back with telekinesis (sans things only he can lift with lifting strength). Precognition helos Kenobi handle the rest.
Couple all of this with the fact that Armstrong is on a time limit abd he's fighting someone who specializes in letting you beat the shit out of him while you wear out. Simply put, if Sam could outlast Armstrong (per WOG) then the grand master of the defensive style of lightsaber combat certainly can too.
Kenobi 8/10.
