Have you actually looked at their stats? Since 2016 fWAR
Ray 3.3, 3.3, 0.9, 2.3, -0.4, 3.9
Gausman 3.1, 2.6, 2.3, 1.6, 1.6, 4.8
They are both 2 pitch pitchers - Gausman's shown significantly better command over his career, while Ray's overcome the walks by striking out more.
Ray's control was the best of his career (BY FAR) last year, while he had an extremely unsustainable LOB%.