Because the number of candidates between 451 and 600 was 7,038 as of 15th August, assuming 50% of that number (plus the five days growth till 20th August (day of the draw)) was cleared, on 21st August, we had about 3500 candidates between 451 and 600. Add the two weeks growth between 20th August and 4th September, we will have around 5,500 and 6,000 in the range of 451-600 CRS. I am not sure per day growth for this range so I am completely estimating the two weeks growth here.
Assuming the lower the CRS in that range, the higher the number of candidates (looking at the pool, you can see there are more candidates as you go lower in the CRS, so within the 451-600 bracket, we can also apply the same assumption that there will be more 451, 452, and 453 than 455, 456, and 457). Therefore, with 6,000 candidates between 451 and 600 and with more candidates in the lower end of the 450s, I am optimistic the draw will be 454 with 3900 (455 with 3600 with 2019 June or July cut off date) on 4th September.