They have a bunch of PFE's (the only Asians in the group), and I know for me (coming from the military) riding the panel would/is a great way to get introduced to the 121 world. And SO's start at $67/hr (same as FO's) so they aren't saving money that way.
And I was not eying the right seat but the left - with their expansion plans and upcoming turnover of the initial Captains (age) upgrade opportunities are going to come quick. Hence why they are being VERY selective in who they hire - as I was told in the interview "we are hiring the people who are being trusted to grow the company".
Cargo360 is run by Americans and is VERY well financed by a private equity group with a good plan (that they brief you on in the interview).
As I saw it: no need for a union unless the deal turns bad. Also, most of the management/leadership are former ALPA, and understand that.
HTH
Spongebob