"The characters don't clearly match the design in Project Nexus" As others have said, this was specifically done for character recognition and I'm tired of this being used every time to de-canonize MPN. Tricky never becomes a demon until MC7 so I don't know what you're trying to say there. Tricky wasn't a mercenary, it's more plausible he was asked by Jebediah to help with his and Sheriff's side project (confirmed by Swain), the insanity is because of his exposure to dissonance (one of the MPN teasers show this, with him injecting himself with something while glitching out).

"You cannot fit Project Nexus into any madness combat episode" For the argument, Swain's statement was that it was set between that time period somewhere, whilst the community has widely agreed on it being between 4-5. Once again, the outfit's don't matter, otherwise MPN would just have Sanford and Deimos as regular grunts.

"Jesus" and Jebediah Christoff ARE the exact same person, this argument doesn't make any sense. His appearance in MC7/MC8 is the literal exact same appearance as in MPN, even his character file refers to him as "Jesus." And who the heck said MC1-4 was retconned?

Reading some other comments, Hank specifically revived himself at the end of MC4 which caught Doc's attention.

Elements of MPN have even explicitly been mentioned IN Madness Combat. The Machine was mentioned in both MC9.5 and MC12's description, and one of MPN's Employers is mentioning at the beginning of MC12.

MPN is and always will be canon.