That's a good question actually. I'm thinking of going to the lab and toy with it too. The one I did was a means of making sure each blow hits on mark. I was afraid of doing the Knee 3x because I was worried the P might whiff and drop it.
Tested it out, 3x Knees > P > DLC works. a 4th knee doesn't seem to work into P > DLC. However 4x Knee > 2P > 2P > 246P works.