I don't think it is such a bad move.
Clearly the Geelong board have been stung by events since and including the PF loss, and don't think merely a steadying influence from someone (recently departed in the case of Hinkley) within the club system is the answer. The Scott boys seem pretty confident and ruthless by nature and Brad's start at the Kangas has been encouraging for them.
That said, if you were Ken Hinkley, you would be wondering if you could ever get a gig.