Brighton performance while Potter was still in charge was completely unexpected, they managed to make a surprise because they were among the elite clubs in the top four. I think Potter made a mistake when he accepted the proposal from Chelsea, he left an in-form Brighton to become coach of a bigger team.
It was not a mistake because everyone would cherish moving from a mid table team to one of Europe top teams. This are challenges that everyone even football players cherish. We could just say it actually didn’t work out like he planned. It will be a big plus in his CV that he has managed Chelsea.