Track has such a fickle fanbase. Every time an athlete or team of athletes don't do particularly well, the solution is to jump ship and switch to a different coach. Then when a team does well, every other athlete needs to jump ship to the coach whose team is doing the best....until they have a down performance then everyone needs to leave said coach.
If Cooper should switch anything up, it's train for the 5k as his primary event. Jerry's a good coach, Ben Thomas is a good coach, Ron Warhurst is a good coach. No athletes need to quit their teams for having slightly underwhelming performances XD this year.