If they valued Cerkownyk that highly (5th round money) I doubt they would have waited until the 15th round to draft him, and I can't see they committing that amount until the pool draftees are resolved, and lastly, he just isnt that type of prospect.
This is how I always hoped the Tigers would draft, focus on upside and correctable issues, and trend younger, where you are on the development curve matters. Now if they can avoid my other pet peeve; don't draft players you can't sign.
He was regularly touching the upper 90's during rehab, and with his extension that gets on you in a hurry, but coming off an injury, you can expect inconsistency as you build up arm strength and settle into a routine.
They needed a shooter on the wing, and they got one on an expiring deal, and picked up a couple 2nds. The have assets to do other things, if they want.
Shouldn't, take who has the higher grade. If it's a pitcher, fine, quality defender, fine. Trust your scouts. If players don't pan out, get better scouts.
Positional value is accounted for in the players grade. It would be a poor approach to draft based on need or position played, rather than overall grade.