Ah, Claire wouldn't stand for Johan, same as he wouldn't stand for Ladd Russo and his gang. He goes against Claire's principles.
Stansfield meeting Light Yagami from Death Note would be interesting, especially as they both have the same God Complex. Though Claire's riff is that he can afford to show mercy as God because he's strong, while Light appears to be the smiting because "he's perfect and morally suprerior" sort.
Amusingly, according to Claire's great great grandson he was still alive (as of 2004), and was still capable of taking on an entire ship of pirates despite being 90 years old.