Dear Aquib,
I am hearing first time that 2-year mandatory period should be spent in Canada in the beginning of 5-year PRC period.
I cannot see such a condition on Canadian Immigration website, which simply says: To keep permanent resident status, a permanent resident must live in Canada for at least two years in a five-year period. (please refer: http://www.cic.gc.ca/english/information/faq/pr-card/index.asp) Also Canadian Immigration Minister Kenney has been quoted as saying: To retain their status as permanent residents, they must be physically present in Canada for two years out of five. (please refer: http://www.cic.gc.ca/english/department/media/releases/2011/2011-12-09.asp). Nowhere does it is mention when 2-year period should begin.
Please advise what is your source of, what you call "as of present rules"
Regards,
Can10