He'll be fine, he's wasting the oxycodone cause he took suboxone earlier. The bupenorphine (suboxone/subutex's active ingredient) has such a higher binding affinity for certain opiate receptors that very little of the oxycodone will actually get onto his receptors. The blocking affects of suboxone is one of the main reason it was selected for opiate replacement therapy. Gotta remember subs are the bastard cousin of methadone.
Also that fact that he combined adderall in the mix should counteract some of the effects of all the opiates he took. To top it all off the doses you described are actually very low for an addict so yes he'll be fine from this episode but you might want to look into getting him some help. His usage pattern reeks of addiction.