Kendall and Bella are not Templer girls, and since Teller kicked up such a fuss over shooting Miley Cyrus and thereby terminating his union with Marc Jacobs I doubt he'd book these girls. So it must've been Wang himself which is odd considering the bad blood between the Wang squad and the Instagirls. Someone's out to get more followers. At least that aligns with his business model, I suppose.
He definitely relegated his core 'squad' to the back to give Bella and Kendall the attention in this campaign, and same for the most recent runway show. That was my guess as to why Lexi didn't want to walk the show. I did gave have a peek at Bella/Kendall's Instgrams and noticed that they only posted solo and duo shots from the campaign on Instagram so I am guessing the disdain is mutual. Even HGO, who tends to get along with everyone, is not following them.
It is ridiculous for Wang to use the whole 'we photoraphed the squad having their own after party' line here. It worked in previous seasons when he used campaign girls that were genuinely best friends (Lexi, Anna, Issa, Hanne, Binx) but the authenticity is killed when you use two groups that obviously dislike each other.