David Shaw
Kevin Sumlin
Charlie Strong
Mike London
Ruffin McNeill
Turner Gill
Randy Shannon
Tyrone Willingham
Dennis Green
All are/were black coaches given pretty decent-to-great jobs. That negates the "we get bad jobs" part. All were given adequate time to build a program, and the ones who did a bad job were shown the door. That negates the "no time to fix it" part. David Shaw and Kevin Sumlin, for example, are both coaching Top 10 teams as we speak and neither one has been given his pink slip on the basis of his skin color.
Embree was right - he did get a bad job, and he got no time to fix it. Neither of those things have anything to do with his race. By most anyone's account, he was thoroughly unqualified to receive the job (think Brewster with far, far less experience) and did a terrible job once he got it. Again, he got fired because he sucked, not because he's black. He had a very short leash and very short job duration because he epically, historically sucked - not because he's black.
Maybe this is why he felt like he did. We don't know what he asked for or what resources he got. Nor do we know what kind of support he got. BTW How many of the coaches you mentioned actually coached at Colorado?