Ottavino: 69 Appearances, 62 Innings
Whitlock: 46 Appearances, 73 Innings
While he may have pitched MORE innings, I think the reduced appearances and additional days of rest was an easier workload especially in the early part of the year when he only appeared in 5 games in April and 6 in May. He had the repertoire to pitch multi-innings and that's how he was used.