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So as we know, MMPR is a huge steaming hit for Saban and he wants more & more of it - but the Japanese stock footage has run out, so he gives Toei a sack of cash to make new, US-exclusive Zyuranger footage. We get new monsters, new fights, and new versions of the Dinozords designed to link up with the 'Tigerzord' from Dairanger (once Dai's finished w/ it). [1] New toys to sell, more money all round etc.
But it was a very expensive move, one that made money back but Saban loved not spending money. It's entirely possible Saban would've gone "nah". What on Earth would Power Rangers have looked like then?