Gon-San wasn't an asspull at all, and was thematically relevant to the arc and its closure. It's sad that /a/ is too stupid to read a children's comic and understand why it isn't an asspull.
What happened afterwards is the asspull.
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>Nuh-uh my power negates anything you can do and i win
Definitely, everything in Bleach makes sense and is handled properly.
Wasn't Gon already older than the cat?