Riley is going to have to solve the swing and miss problem with giving up much on power. He is 5th percentile on that, and 10th percentile on contact overall.
As for defense, "decent" is probably the nest way to put it. plays like the diver on Saturday notwithstanding, he is solidly middle of the pack when it comes to turning around routine plays regularly, and on plays with 2+ star degree of diffiulty. He's got decent reaction time, but so-so burst speed and below average routing to the ball. He is 10th percentile on arm run value, though, and 20th percentile on arm strength. Bottom line on him is, he is acceptable in left as a 24-year-old, but the physical skills he has that we expect to deteriorate is going to show up in reduced defensive utility long before his controllable years are up.