I suspected this for a while, but now I’m fairly certain that Kunishige saying that Chihiro is “logical like his mother” is HIS interpretation of Chiaki’s interiority and motivations. Instead, they’re alike because they tend to set aside their own desires for the sake of others
At the 18:50 mark of Meitantei Precure episode 30, you can see a rainbow forming in front of Cure Arcana Shadow after she shot a beam that almost hit Cure Eclair. This shot is important because it signifies that Cure Arcana is gay as fuck for Cure Eclair