hahaha yeah he's referencing Michael Jackson who Rihanna sampled in her song, and i believe the sample is the same sample as power, at least the voice chants are, if you go listen to the original sample you'll hear it.

I'm sure Dephira was joking. I hope so, anyway

Kanye didn't sample WBSS for Power. I forget the exact sample for the chant, but it's different.