If there's an unspoken rule in One piece then it's that having your will and spirit broken is the biggest nerf/down a certain character can have, and that exactly happened to Moria.
Look at him in his youth, full of spirit and willing to challenge even the strongest foes, and in his Introduction pre ts he sits on his ass, speaking about how others should make him the PK.
That alone speaks volume.
You're trying to squeeze in logic that probably not even Oda cares about, bro. Not saying that you're wrong, but it's heavily looking like the Moria we know is a shadow of his younger self.
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I'll cream my pants just by imagining this