If you were going to move Ghost, you'd wait a year, hope he bounces back and improves his value, and let Sanheim get his feet wet in the NHL.
If Sanheim and Myers are the real thing, trading Ghost for a top center down the road is a real possibility, their upside is much higher simply due to their size, but Ghost playing like last year would have significant trade value.
Whether the hip surgery explains the offseasons for G and Ghost remains to be seen, it's possible because it may take time to rebuild the core muscles after that kind of surgery, and it's hard to do so during the season. However, glancing at the net, the timetables I see are more like 6-12 months, so they should be skating better this spring.