When we win training games which we instigate, I think we jump to the ranked position of the person we beat. When we lose such games there is no change in our ranking. When others beat us in games which they instigate, we drop down the rankings. Do we drop to where the person who beat us used to be? That would make sense. Presumably if we win a game instigated by another player, both rankings are unchanged?
When a team challenges you and they win, they take your place in the rankings and you drop down one place. You are correct to think that the rankings are unchanged when you win a game where you have been challenged.
Thanks for the info =)