Based on what I can tell, Nae X locked the PPP on 20 November 2013 when she changed the parents from Pike-232 and Sanders-694 to Pike-51 and Saunders-787. I can only assume that she believed that there was a risk of someone switching them back and wanted to lock these parents down. If the risk no longer exists, then removing the PPP should be fine. Nae X does not appear to have made any updates since March 2017, so I don't know if she can provide additional details, but I would hope that after 3-4 years of PPP, the risk of parents being altered may not be as great as before.