With no minor league season, it would be insane not to have him on the roster from day 1. He already missed all of 2018, and now 2020 is compromised due to Covid. He turns 24 in 2 months, and pitchers who throw that hard have an unpredictable shelf life. I mean, if everyone stays healthy (big if), he'd only start about 12 games in a 60 game season, but that's better than being on the taxi squad throwing fake simulated games. Of course, starting him on the roster right away means that him, Vlad, Bo, and Biggio become free agents at the same time, but between potential work stoppages, CBA changes, etc, in the coming years, just put the best players on the field when it makes sense to do so.
If Pearson is on the taxi squad because we have to take a long look at Chase Anderson, Borucki, Yamaguchi, etc, in the rotation, then even a 60 game season will start to feel long. A rotation of Ryu-Pearson-Shoemaker-Roark-Thornton actually looks decent on paper, and the other guys can be used as depth in case of injury.
Although they have to explain how the 40 man roster situation works in a truncated season.