I think Paulus redshirting would have been a poor decision for multiple reasons: 1) obviously Duke would have been very rough on offense, but, more importantly, 2) I think Paulus would have been very tentative coming back in a year. While this year was tough on him, I think he learned a multitude of good lessons while working through his injuries.
He learned how to guide in and play in an offense that didn't have two predominant scorers. He learned how to deal with people bashing him (that includes me), which certainly made him tougher mentally. I could go on and on, but I like the toughness he showed by grinding this year out.