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I think Nickelodeon wants to end the series on a high note, and by that, I mean having the Crossover Arc be the Final of this series.
I think it makes sense, cause ending the Final Season in the Future Arc, would be a downer.
Since Season 5 is called Tales of the TMNT, I guess anything goes as far as stories are concern, They can do stories that can go dark, and stories that are more lighthearted, and those crossover episodes are on the lighthearted department.
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