hope you'll excuse me mega, but i cringe each time i see that 'intrawebz lore' repeated: there are no '8 texture inputs' to the TEV per se - it's just 4 new constant registers in hollywood's TEV. but before there were already more than '4 inputs' to the TEV to begin with (interpolants from the rasteriser, texels from the TUs, EMBM matrix registers, etc) - there were never '4 inputs' that 'doubled from flipper to hollywood'.
let me recommend a paramaount document to you - hitmen's YAGCD - check it out.
Which, of course, is a document that was put together describing the GameCube Flipper. Only people who have the tech docs for the Wii GPU are in a position to make direct comparisons between the two.