I have 3 player with still 9 star they now 24 n 25,but they don't maintain the star anymore cause they gain less than 15sp of the 75 u need,I had more 9 star,I guess 8 In total but they did good till early to mid 20th,now I have 3 with 9 stars 7 with 8 n 2 with 7 ,they usually mid 20th,but no one will keep now star,so in 2 level from now I'm back to scout team with 30yo player,after getting 9 star u can train what u want,they train too slow,if u don't keep use token they never maintain it through training ,too expensive to do that,at least for me,maybe others do it each season