Was also probably the hardest worker and the offensive line leader for the team. That's always who you go to when you need a team member to light a fire under someone's ass.
Which is part of the problem, not part of the reason what they did was smart.
The guy has a long standing history. Only in the last year or two had his reputation sort of shifted, after having spent the first 15 years of his football playing life as a thug. If the Dolphins assumed on the most recent snapshot of his behavior was the most important, they were dumb to think so. Obviously. Dumb to the point of negligence.