About the use of controllers, it could also be explained by him being scared of being called a nerd for playing with keyboard and mouse.
Him being scared to just admit "I didn't really play X or do Y back in the day" has led to thousands of lies at this point it would be a 20 hour video easily of him just bullshitting.
So I just watched him and clipped him saying "Yes I was a fan of Shawn Michaels in the 90's. Then I stopped watching wrestling, I missed the DX (Degeneration X) era, ..." Problem with this? He had Degeneration X collectibles, Degeneration X shirts (yes plural), and remember the famous fight with Viscant where he wanted to "prank" everyone else by doing the Degeneration X Crotch Chops at them...despite the fact that he had talked shit to the dude enough to get him to agree to fight him physically, he was now asking him to prank everyone else. This only makes sense when you remember he was more scared of being embarrassed infront of everyone else than the actual beating. He knew he could retard luck/survive/walk away from a fight because no one in this kind of scene is going to hospitalize you. But he also realized he would never be able to show his face again if he was beaten infront of everyone, and wanted to turn it into a prank against those who would potentially wrong him in his anxiety driven predictions, people who would laugh at Monkeyspank moreso and run him out of more things. Final key to this bullshit easily dispelled lie about DX era, DSP renamed himself "DXP" during this time, in reference to it. No lie. He's more lie than man, he's more fake life through fake fanning everything and hiding his real shit (needs glasses, but they're nerdy so he drives dangerously, watched anime, spent years shitting on anime art style and how it was for nerds and losers, played every franchise you've ever heard of but remembers nothing and can't play them).
Took a week or two before the lex stuff really got to him
Personally, I think what broke him was people telling him they were going to build legos. It wasn't until it felt like they were poaching his viewers that he really got upset. It annoyed and embarrassed him for sure, but stealing his viewers on something as much of a money-lock (in dented minds) lego would be was beyond the pale to him, and he crashed out like when an ad for another youtuber or featuring one at least was put on his videos back in the day and he flipped the fuck out on video and to YT about it.
He's mostly just retarded, literally. His IQ is around 75-85 and he is "untrainable".
The beginning of every game, especially action or puzzle games makes this incredibly clear. He has mentally handicapped himself moreso than Linda did.
he quiets the voice chat in every game that has it because he is afraid of what people would say.
Again, the public dunking is just too much for his ego. He was bullied and even to this day has no idea what to say to someone fucking with him. What, really you're going to agree with them and say they know every inch of your cock and balls? That's like second grade tier exaggeration in response to bullying. Fake "i'm playing along and this doesn't affect me". No attempt to roast them back, never. He still has never learned to hang, he's still a socially stunted, mentally stunted 14yo who thinks he's hot shit and a grown adult while still overdrafting his bank account and taking credit out for Wrestling for fuck's sake. What are you, 8?