
Actually it's 10, not 9. The rest is correct.

Now I'll call the total level of your team Unit Skill by point, each 10 Points you get 1 Team Unit Skill Level. Your team always start with 10 Points (even if it's empty), and when you put an Idol with Unit Skill Lv10, it's 10+10=20 Points, so you'll have Team Unit Skill Lv2. If all your Team members (9 girls) have Unit Skill Lv10, you'll have 10+90=100 Points (Team Unit Skill Lv10). That's why if all your Idol have Unit Skill Lv5, then it's 10+45=55 Points (Team Unit Skill Lv5).
