When it comes to Donkey Kong..

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mjo011 said:
Being able to control the second character also gave the games more depth than in TF

How dos that give it any more depth? The second character represents a separate skill set, the only difference is that instead of having to switch like in the SNES trilogy, in DKCR/TF you can use both skillsets simultaneously. It's just a more convenient manifestation of the same fundamental mechanic.