The only thing I know about Bailey as a pitching coach is what the media tells us the past month: that he greatly improved the San Fran staff in his years there.
But without going into a deep dive, I looked the 2023 Giants' stats: they literally had a three-man starting rotation -- three full-time starters who started 33, 28 and 19 games (that basically covers half their season schedule). But they had five others who were primarily relievers who started 10, 10, 11, 12, and 13.
In comparison, the '23 Red Sox with their doomed blooming openers featured five guys who started at least 19, plus swingman Pivetta, who started 16.
The word on YeahRod is that some interested MLB teams want him to start.