im not saying you NEED two pld just so you can keep it up because its too hard to keep up for naraka. the order in which mobs killed are not always the same but generally we kill naraka last for wave1 with the kiting pld getting in for circle but this is also determined by what stance he is in. wave 2 iron giant is the only mob that we keep in the same order, and hes always first of wave 2. if by some chance that wave 2 naraka is in mdt stance we will generally get it out of the way while it is up, and will get the OTHER non kiting pld in for circle.
i understand that this can buffed up to 4:30 duration/recast, but again this is just more of a failsafe depending on the order in which mobs are killed.