@legalfalcon
I also have similar situation and got a GO last week. When I called IRCC they did not indicate any changes on my case, I will try calling them again next week.
The only other reason I can think of is I did sent my Tax assessment through WebForm and got a confirmation they received this week. Is GO is because of adding this document to my file?
For Inland, PNP 1st GO is kickstart of eligibility right?
The stages of an EE are:
R10
Criminality
Medicals
Eligibility
Security
Most applications are processed in this order:
R10 - Criminality and Medicals - Eligibility -Security
The first stage R10 (completeness check), if the application is incomplete, it will be rejected. This is why it is the first stage. Along with the R10, based on your PCC, the criminality is done, unless you are an inland applicant who need to submit the RCMP, which is requested later.
Around this time, the medicals is also done. Usually the eligibility will not start unless medicals are done, because if an applicant or a family member is medically inadmissible, there is no need to do the eligibility.
Then starts the eligibility, which is the comprehensive review of all your documents. It takes place in 2 stages and is time consuming, eating the most of the processing time.
Only after the eligibility is passed, the security will start. Since the security is done by agencies other than IRCC, like CBSA, CSIS and Public Safety, this is the last stage. See
https://bit.ly/2OSkDRZ
The processing is the same for FSW / PNP / CEC barring a few exemption where some stage may starts before another on a case by case basis.