Riley is decent. Has decent skills and smarts but he seems kind of undersized and lacking in power at cruiser. would be athletically outmatched against Opetaia who I'd say takes him out in around 8 rounds.
Opetaia is a stretch as it stands, but a Pat Brown - Riley fight would be an interesting one. Riley more skilled in my view but Brown very durable and certainly powerful.
Riley is overrated and has a KO ratio of only 50% and can in no way threaten Opetaia, Opetaia by KO...