Okay Completionist started 2011 or 2012, he has a costar named Greg and it seems they met at college and were friend. Greg played the comic relief of the show at the time. Fast Forward to 2015, he leaves unexpectedly. Then fast forward another 2 years when in 2017, Greg I believe with lawyers told Jirard the completionist to unlist all the episodes Greg has appeared with. That is basically the story of Greg. It seems there were issues with extended work periods that didn't gel well with his schedule and priorities and good for Greg understanding that since choosing loved ones over work is rather important. It seems Greg got shafted because Him and Jirard had a falling out and there was no formalized contract between them since he expected friends to look out for each other. It sucks but I consider money to be a part of the equation with the removal of those old episodes since he didn't like the company using his image to earn a profit.
Also take this with a grain of salt but apparently he also made a post about it on reddit in the past with these lines
"It is extremely difficult to move on from a project that I helped create for so many years. Not only were we building the show as a creative outlet but, also as a source of monetary stability for the both of us. Both of these are no longer true for me. While we may have not put in precisely equal hours on the show, I believe that had Jirard and I's mind not morphed into one for four years, TOVG would not be what you see and enjoy today."
This could be a random poster and not be Greg, seeing as this is their one only post. I just don't think its a huge leap that money and friends typically don't mix well. Money breaks bonds in so many different ways and its a prime reason why I don't like dealing with loans with friends or family. It really rarely ends well.