Defender puzzle with 1 trade

[Lobbus]

With one trade what would you do with this backline and who to play?

Goddard, Enright, Stanley, Grimes (mediocre scores), Hanley (could be shut down low score), Duffield (playing lock-type roles, but many Freo mids out so could roam thru midfield this week), Gibbs ( mediocre scores), Trent Mckenzie. Have 10k to spend. have done other trade already. Thanks for your responses.