Kendall would have walked Miu Miu had she attempted Paris, she did not step foot in Paris at all. She was the only "instagirl" that walked for the Fall 2017 show last Feb and all of Katie's and Bitton faves who were in Paris walked Miu Miu today. I think she would have walked Balmain and a good chance for Chanel. She could book other shows like Elie Saab, Mugler, Sonia but they really try to have her walk only the top shows available to her. These girls historically never walk the top Paris shows... Dior, YSL,Valentino, LV, etc...
Gigi also could have booked more shows, maybe she chose to be exclusive for Marant to get the campaign she has closed the show for 3 seasons now... Not sure what happened with Bella but it will be interesting to see what happens in Feb. for them.