Add Lawrence Frank to the list.
I msut say that I'm somewhat puzzled that the conventional line of thinking here seems to be that Doug Collins is a really good coach who was unjustly fired. Collins has precious few legit accomplishments on his coaching resume. In 11 years as a head coach, he has won four playoff series. In his last 8 years as a head coach, he has won 1 playoff series. What has he ever done that makes everyone think he's a great coach?
And per Zach Lowe on Byron Scott's performance in Cleveland:
If Byron Scott is really on the hot seat, even though he's on the books for $4.5 million next season, it will be because the Cavaliers' defense has shown zero improvement. They're 27th in points allowed per possession after finishing in the same spot last season, and though it's tempting to blame the Anderson Varejao injury, the difference defensively without him on the floor has been negligible, per NBA.com.
There are obviously some mitigating factors. The Cavs are young, and young players are generally overmatched on defense in their first couple of years in the NBA. Starting Tyler Zeller at center is a big disadvantage; bullies can push him around, and like most rookies, he has found NBA-level help-and-recover stuff confusing.
But the lack of improvement in the big picture is alarming. Kyrie Irving is almost no better in Year 2 than he was in Year 1 (which is to say, he's not good), and there is just a general lack of coordination to Cleveland's defense that would worry me if I worked for the team. The Cavs can usually execute the first step of help defense without any problems, but the steps that must take place behind that first line of defense are a complete mess. Nobody helps the helper at the right time, guys are way out of position, miscommunication is rampant, and teams generally score easily against them.
Again: Bad defense from inexperienced teams is expected. But the Cavs haven't shown any improvement, and mass confusion of this sort is alarming.
Typically, if you don't get the job done, you get fired.