quick answer without seeing the person..NO, NO, NO!
Going barefoot or minimalist is a great goal but most people really cant just go straight into them, particularly an experienced runner.
What I would is test their dorsiflexion. Likely you are going to see that their range of motion is limited. This is likely a result of improper footwear. When you look at a running shoe, you should be careful to note that the heel can lifted up to three inches above the toe. This creates a situation, in which the Achilles gets all tangled up and the foot wont be able to properly dorsiflex. Being that everything in our body is anatomically connected, we end up with a hip that can slam up against our lumbar with every step.
I would certainly consider a change in footwear, but not to minimalist yet. I would look to go more neutral but with orthotics.
Hope this helps,