He ate atleast 3 monster left hooks unphased in round 1.
That last hook Darling threw was as good as you can throw it and Gamboa got hit flush, so I say his chin is pretty solid but it hasn't been tested fully yet.
To me if anything, the change in Gamboa's fighting style was more a realization that he needed to conserve his energy rather than him being in any way hurt or stunned by the knockdown.
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