I'm still not sure Crawford is going to be as good as Marsh, or say, Ben Revere. But they gotta find out. They probably need to trade Marsh if they are ready to bring up Crawford and can't unload Nick (unless they are ready to for-real platoon him). Marsh is a better LF than CF and so apparently is Crawford. So they really are redundant LHB OFs.
But none of the above really fixes what you call the mess. They need one surefire everyday big-hitting corner OF. But this is the minors thread, so I'll stop there.