I also got this impression and believed it was foreshadowed quite a bit. Even Kavaxus's devious smirk when Tiger Claw questioned Kavaxus's interest in Shredder's resurrection seemed to hint that Kavaxus would betray him eventually.
I still wonder what happens to Fishface in the midst of all of this because he is not present in the sneak-peak for the final episode and we're even told that there would be a rematch between Fishface and Raphael at some point. Perhaps Fishface lives on and gets defeated once and for all by Raphael?
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