The Completionist video pretty much explains it all. For whatever reason we do not know why he left, but I am personally sad to see him gone since he usually brought the comedy to the videos. I will admit that he had become less humorous with each episode so I may think it may be a mix of burn out and having a family that made him leave. Nevertheless it looks like he will not be replaced for the time being.
Jirard came out later and explained everything HERE.
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