Nice, if small, progress with Erica. She certainly worked hard for it.
I am guessing the OG/game Harold (i.e. the one being overwritten by the MC/isekai Harold) is somehow also being changed by now, especially since the isekai Harold tapped the OG's power on that last bit of the battle. It's like the OG Harold is melding itself to its new circumstance (and also the butterfly effect is also slowly changing him inside)
It's hard to say how much of that scene with the original was symbolic, how much concrete, but at the end of the day, the old Harold wasn't necessarily evil because he wanted to be. In fact it seems like the only thing he personally wanted was to be strong. Strong in combat, but maybe also strong mentally. His evilness came from his background in the awful household. So, being strong mentally might have been an effort to overcome his personal history. Unfortunately he ended up serving Justus, who most likely corrupts all who work for him, so in the game Harold's fate was sealed. This is all naturally just my own interpretation, but if it's accurate, it's quite possible the original Harold doesn't mind neo-Harold's path as long as it makes him strong. Harold has spared no effort to be strong. He's even regarded as a genius among the knights, joining so young, which should please the original.