I think if somebody do enough effort in a rip (and I do know this is the case) it's in all of their right to claim a credit.
But, at the same time, who actually assures you are being actually credited? Or even, does people actually care about being credited? Crediting people isn't even a mandatory thing in smwhacking, it's just a tied moral thing. For example, I've seen several hacks where I do recognize my graphics (which are all rips) and I don't care if I'm being credited or not.
So in short words, this kind of "discusion" is irrelevant, from both sides (in my opinion).
That said (and leaving behind this discusion), nice rip!
even though I spent a lot of time working on it? why not? i've asked credit for my other rips and nobody complained. Besides, other people ask for credit sometimes too. spriters resource rippers also ask for credit. so, there's no problem, right?