McScream and Cooker were created because the authors and Crash X Fusion are all Total Drama fans, so the Shout-Out was intentional.
Witch Rick making his official debut within the series came from Ultimateheatblast4 requesting a crossover with Rick and Morty, which is unlikely to happen.
Word of God: Boscha becoming a main character was due to her larger presence in the events of the series up to now, a stark contrast to her irrelevance in canon.
