I think it stems to something I believe
@Alicia spoke of: that NBCUniversal may be contractually obliged or required to incorporate other Nintendo IP that would be included in the original contract. So-far, we only have Yoshi's Island, Mario Kart 8, and Super Mario 3D world as the primary inspirations. Would make sense we eventually see DKC into place into the park.
EDIT: This might actually explain why we heard of Zelda at IOA, because it could be part of the core that is contractually obligated or required down the road.
Did some checking on that, and Osaka's DKC seemingly factors around that of 2.05 acres.
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The interesting thing is, Soundstages 7 to 11 (the soundstages that you suggest); from the backstage gate currently at Super Nintendo World, if you use that as the connector you get 2.3 acres.
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Remove the walkway to the potential expansion in-between Jurassic and SNW, and it's around 2.13 acres. More than enough space for a modified Donkey Kong Country.