So here is my two bit..
CIC has established a target of 74,900 admissions through EE in 2018. Canada has now issued a total of 14,500 ITAs in 2018. It leaves us with around 60,000 ITAs to be issued this year. With 3000 candidates being invited every 2 weeks, we have 60,000/3000 = 20 rounds to go before CIC fulfill its target.
Now, its Calendar Week (CW) 12 next week which leaves us with 52-12 = 40 CWs in 2018. For 20 rounds we will have at least 40/20 = 2 week interval between successive draws based on the above target of CIC.
So it will all depend on the replenishment of 450's in the pool (I don't now the analysis of that) but the chances of back to back draws look slim to me !
Please do correct me if I have considered something wrong here... I am still a newbie here