I think neither of those guys should get more then a training camp invitation on an unguaranteed contract.
Hunter is undersized to play the 4 spot, but might be able to contribut some(about 5 minutes a game).
Oyedeji would hardly play more then Hunter and i'd rather go and sign guys like Earl Barron or David Harrison instead of him.
Jackson has teased a lot of folks, but was never able to translate his game, which was great at Oregon, into this league.
So instead of going for those guys(who should be the very least option of an NBA team), we should rather look what we can get for the rest of the MLE and the LLE. Guys like Kwame, Brian Skinner, Randolph Morris, Jamal Magloire or even Adonal Foyle come to mind.