Yes brother, there will be possibility to reject the application due to the below points -
And if VO can cover these check on quickest time then you will get MR+PPR within 60 days time or more from your AOR.....
Background Check by Visa Office
There are total 9 factors that can cause an applicant inadmissible to Canada during background check.
1. Criminality (have a criminal record in any country)
2. Organized Criminality (Org Crime in GCMS Note)
3. Security (failed background checks)
4. Human and International Rights Violation (HIRV in GCMS Note)
5. Health (failed medical exam)
6. Financial Reasons (have less then the minimum settlement funds)
7. Misrepresentation (failed to be truthful during the application or omitted information)
8. Non-compliance with Act (failed to provide any requested information/documents the immigration officer requested or failed to attend a Personal Selection Interview)
9. Inadmissible Family Members (the above reasons for any family member indicated as a dependent on the application form)