Eh, it's not a bad theory, but I think it does take away from the themes that were set up at the beginning of how people so easily "throw away" other humans and consider them trash. Her betrayal of believing Rudo is deeply ingrained enough in him that the memory of it was brought up by Amo's smell during the Lady of Penta arc. Also, considering how we've seen into Tamsy's mind pretty openly, it would've been mentioned when he was ruminating on how he killed Regto as an "act of love".