O’Brien is technically not a prospect based off the number of days he has spent on a major league roster – even though for most of those days, he was injured. Drew Rom fell into the same boat this year. He went on the injured list while he was on the big league roster so all that time gets counted as big league service time. I know Brian &Blake still ranked Rom despite that fact so I’m ok with ranking O’Brien, although I will say that I took both out of my rankings because of lack of eligibility.