In trophy room, you can only see his league position in last season and the no. of seasons he played with this team. This number does not represent his league level in last season. He may played 26 seasons with this team. But his team does not promote in every season. In last season he finished 7th at league level 8. So now he's at level 9 with you. I guess you are confused with this, not the manager level.
If Q69 is the max quality you can buy in auction market, Q70 players may be brought through scout list. Or that manager can train his Q69 player to Q70