Is Summer related to the Zanes somehow?
Hear me out: We know that Nika and Nami has this 'bibi' joke going on, right? But it's shown in Chapter 1 that this was actually brought to them by Summer. The thing is, I'm playing WIAB right now - which its supposed to be quite a few years before SG - and it's said that 'bibi' is a word that was created by William, Leia and Katie during their childhood. So, if its a made-up word by them, how does Summer knows it?
I know it's a small detail but, is it a valid theory or Ocean just wanted an excuse to put the 'bibi' thing in SG too and it's not really something relevant to the plot?