I can't repeat this result unfortunately. Tried it with my first team who have already done a 6.75% set today, and the three at 2.25% still didn't get any of them up to 10% Team Play bonus. I'll try again tomorrow.
This was my worry.
My 1st team may not have been at exactly 8%, there's no way to tell.
If they were at say 8.25% when i started then it would obviously take less to get them to 10%