Like me, I honestly doubt they gaf lel.
If you didn't "gaf" you wouldn't have responded like you always do when you're "butthurt lel"
Well, for one, it would be a god-tier asspull.
Please attempt to show a little thought process, originality and reasoning in your statements. The term you are looking for is a diabolus ex machina and not only is the direction not that, but you are abusing the term and using it out of context simply because you dislike the idea. There is absolutely no conception or objectivity in that. In my opinion, it would be foreshadowed by Rinne Tensei being a jutsu, much like any other jutsu, with a weakness and it originates from Madara's eyes, thus it would only make sense he would have control over it. Are you going to call Tosuka blade, Yata mirror, susanoo, Chiyo's resurrection technique, Rinne Tensei itself, Hidan's immortality, Edo Tensei, Madara overcoming the edo tensei release, Izanagi, hashirama sage mode, kabuto sage mode and several other devices "asspulls" as well next?
Of course you will, because you dislike any twist or device you either cannot see coming or do not favor and automatically label it "asspull!" You're as one dimensional as a soap opera fan.