I will always defend Markus being able to kick Connor's ass. Markus is not 'just' a domestic android. He wasn't made specifically to be a caretaker for Carl. His origins are mysterious, he was made as a part of a Cyberlife secret project and then later given to Carl by Kamski as a gift when Carl had his accident. He's an RK prototype, just like Connor. And yes, he's possibly a great deal older than Connor, but that doesn't automatically mean that Connor is better, he's just newer. Also, Markus is more durable and resourceful than Connor, whereas Connor is faster and more efficient than Markus.
IDK, it just bugs me when people dismiss Markus out of hand because "ofc Connor is better because Connor's an RK800 and Markus is just an RK200". Because that's just incredibly lazy thinking.
I'm also in no way saying that Connor can't kick Markus' ass either. I do actually think that the odds are stacked slightly more in Connor's favour, especially if he's got a gun in his hand.
But like, maybe don't just base your opinions of Markus' abilities on what you've just seen him do in the pacifist path, whilst looking at the whole scope of Connor's story.