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Western comics in general have a more complex production environment compared to manga; for instance Toyoda once commented he was surprised that western comics change artists per issue.
The review process from Sega is also anoher hurdle as it there is a language barrier with the marketing staff from Japan, a lot of people that worked with IDW have talked about this. This process probably smoother for the mangaka because they are making a single self contained story in a medium more understood by the Japanese review board in contrast to the Western Comics.
Creative culture clashes between the East and West has been slowing Sonic;s development since Sonic 2