Manny Machado was worth 7.5 rWAR in his age 22 season, Gunnar 6.2. I'd say he's in okay company and on a decent trajectory. I can understand a little bit more with Rutsch but Gunnar looks to me very much on the superstar track, and I wonder if he won't age a bit better than Machado has (Machado's age 24-27 seasons were relatively average minus his 2015 contract year), or follow a more traditional trajectory.