Being from Bama, I might be a bit biased, but unlike Burfict, Foster was never antagonizing the refs and coaches, headhunting players, nor did he have a problem with flags and outbursts. He was a leader in the defense throughout his career, and just as @BmoreBird22 said, I imagine that his situation at the Combine and the pressure that comes with the Combine. This is much more the problem of one outburst (that from memory, has never really happened before), not insinuating major character issues.