I have taken Relay leg Splits for both teams(US 1 & US 2)from my Video Tape.I have recorded the meet on my VCR, and I have analysed the relay legs and taken Split Times for each leg of the 2 US teams. The video is quite clear and I have a good eye so the Splits are quite reliable.
1st leg: J.Drummond, 10.46s (10.46s)
2nd leg: B.Williams, 8.83s (19.29s)
3rd leg: D.Patton, 9.41s (28.70s)
4th leg: M.Greene, 9.07s (37.77s WL)
1st leg: J.Capel, 10.44s (10.44s)
2nd leg: J.Gatlin, 8.99s (19.43s)
3rd leg: C.Miller, 9.73s (29.16s)
4th leg: JJ.Johnson, 8.99s (38.15s)
Mo eased off in the final 20-25m when he realised the lead he had over JJ Johnson.
So in a way he ''allowed'' JJ Johnson to make up some ground in the final 20-25m.