So, you think that talent just showed up on the doorstep and the respective coaches had nothing to do with the talent on the team?
No, see, you have it all wrong. Colbert is responsible for drafting and developing players like AB, Bell, Heyward, Cam Sutton, DeCastro etc.
Tomlin is responsible for drafting and the subsequent failure of players like Mike Adams, Jarvis, Golson, etc.
Those players acquired in FA that shine, came here because they wanted a GM like Colbert.
Those that came here and failed, came here because they wanted a coach like Tomlin.
The delineation is pretty clear. You just have to read the tea leaves.