It was not 200s at PB level, the faster he did in those workout was 2 reps in 20.5 but it was very relaxed runs and no max effort, just let it flow.
An other guy went 21.1 indoors on flat bend lane 1, while he was supposed to do a 26sec run to take the heat out. So i agree than going from sled to a couple of SE runs make the SE runs very fast but you should be very careful that the athlete is not going for a fast run and is very relaxed. Also we are using 5kg sled for those workouts, the guys are doing 30m in low 3.7 for 30m unload PBs at 3.4.