Some clubs definitely do not pay more than Hibs in League 1, most probably do. Plymouth I’ve no idea about however. But when I heard he had offers from Cardiff and Marseille I could understand him leaving for the potential 15/20k a week + top level football to get back into Nigeria’s squad for one more AFCON. But if it turns out it’s to go to Plymouth for just a few extra bob (at best imo) I think it’s a waste of what was a good thing he had at Hibs.
EDIT: A quick google search comes up with this “Of the Devon clubs, Plymouth Argyle’s average weekly wage of £1,369 is the fifth lowest in League One”. As of May 2018.