I don't think so...this trend is only for those who applied in second week of nov 2017 and in Dec. And, yeah it's weird how the first week of Nov applicants got their MR after a year and second week got theirs in 5 months.
CIC is completely weird
Inland Applicants who applied their file in second week of Nov 2017 got their medical request in April 2018. And Dec 2017 applicants got their medical request in May 2018.