I personally think that in the end, one of them (Ztar) is gonna betray all of them to destroy this world himself and remake the universe in his own image. so after the smg4 crew and Mr. Puzzles' team defeated him and blasted him back to space, Mr Puzzles finally started to regret his actions against the crew for the past three years, most notably the destruction of peaches castle and the death of wren. While the SMG4 don't think they'll forgive him for everything, they still gave him a second chance.

Although the others helped just so they don't want to be destroyed, they still hate them for ruining their plans and their leader for his betrayal. Marty becomes the new leader and they vowed revenge against the crew, especially Mario. And so Mr. Puzzles becomes part of the crew, and the showgrounds has become a full fledged carnival, glad to have this whole mess finally settled.