これみんな背中でピースしてるのは何か意味あるのかな？次の選抜とかか？

https://i.imgur.com/iTGyzp0.jpg
https://i.imgur.com/ovwRGjb.jpg
https://i.imgur.com/POXhHIV.jpg
https://i.imgur.com/3cJ1nRy.jpg
https://i.imgur.com/EgEE0gU.jpg
https://i.imgur.com/WKahn5a.jpg
https://i.imgur.com/Kt5j0rm.jpg
https://i.imgur.com/Iq7fbUr.jpg
https://i.imgur.com/6nxMzKo.jpg
https://i.imgur.com/dU2oV8X.jpg
https://i.imgur.com/PH7oPCH.jpg
https://i.imgur.com/vkQPo5s.jpg
https://i.imgur.com/sP8dAyB.jpg
https://i.imgur.com/QZWSMAx.jpg
https://i.imgur.com/G5bEBb9.jpg