@Legend
From the 'ladder' section of "Help/FAQ":
"Inactive players will be removed from a ladder if they have no games in progress and they have been inactive on the site for 60 days."
So, how long has that opponent been inactive? They are supposed to be removed after 60 days, so if it is longer than that you should probably send feedback.
@quagmyr saidFrom "ladder help:-
I have challenged a player 10 spots up and did not see that he was inactive and he has not moved in 80 days and has 17 games in progress. What is my option from here ?
If you lose a game that you initiated then no change will take place. You will retain your current position on the ladder.
So you may be able to resign the game to enable you to challenge someone else.
I don't think this will affect your rating.
Otherwise, send feedback and ask for the game to be deleted.