Parson's still Parson if he still cares about what words he can use. If he's got his sword belted, then apparently "ruthlessness" doesn't interfere with other aspects of his personality.

I don't think Parson is aware of or worrying about Sizemore's morale right now, but I'm guessing Sizemore has a good loyalty score, so Sizemore's personal problems will remain his own.