Okay, if anyone has a spread sheet detailing all of the interpersonal dynamics of the family, I really would like to see it and see how it compares to what I can ascertain, cause that callback to Mei and Shizuka being co-pilots, aside from being adorable, is making me want to chart the dynamics but I don't think it would efficient to do it myself if someone already has one made.
If the one Rentarou ate was the Gomu Gomu no Mi, were
all the fruit Gomu Gomu too? Would the entire family turn into Luffy? Or crazier,
Were it not for the sheer insanity Rentarou can achieve thanks to his love for the girls, I think this chapter firmly establishes Rentarou would have gotten himself killed ten times over with his lack of survival skills and common sense.