1) He wasn't good in Detroit? He made the playoffs twice (first Detroit coach since Bobby Ross to make the playoffs twice) and only had 1 losing season in his 4 seasons. By Detroit standards he was outstanding, evidenced by the absolute garbage job his successor Matt "Never seen a sandwich I wouldn't eat" Patricia.
2) You say no to Caldwell but would consider Marvin Lewis? The same Lewis who was coach in Cincy for 16 years and had a grand total of ZERO playoff wins? 0-7, and never made it past the WC round.
To be clear I say no to both, but acting like Lewis is some major level above Caldwell is a bit laughable.