Not to be a complete smartass,

BUT....

Is he going to show up at Omni with Tumbleweed on his resume?

Doubtful.

Will Omni have any way of knowing that he wants to bail and get on at FedEx? Not any more than the other 90% of Omni pilots, so he's fine. (Not a jab at Omni pilots, just trying to make a point).

As for Tumbleweed: we went through a spasm of hiring international heavy jet guys a couple of years ago, but I don't think that will happen again. PIC time is golden, jet PIC time is better and 121 jet PIC time is the best. If you have at least 1,000 hrs jet PIC then the move to Omni might be worthwhile to get the international time, but if you are looking at a pay cut it's probably not worth it.

Good luck with your career!