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After the directors, writers and actors, there were no links between TMNT and the other films. The connections are:
Garrett Warren who was a stunt/fight coordinator for this and Avatar.
Joel Negron who was an editor on this and the Mummy: Tomb of the Dragon Emperor, called The Mummy 3 on the figure for space reasons.
David Leitch who was a stunt/action coordinator for this and Wolverine: Origins.
Apparently there are people out there with very specific and very in demand skills.