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No plant will ever have 100% perfect leaves, 100% of the time...........you are over thinking things!
New growth is fine.
A plant this size/age and growing in decent soil to begin with will not have any deficincies.........it should be impossible.
Maybe K-tox? That's not normal progression for n-deficiency.
In the more recent pictures, looks like that damage is not progressing, so i wouldn't react to it.
Were those crispy leaves touching the substrate at one point? Any foliar spray used?