Getting MR doesn't mean u have cleared the 'Admissibility' which is the next and final evaluation step after 'Eligibility'. Perhaps u have to pass both the Medical and criminality check and then u will get the PPR or will pass the admissibility. For example in my case I was requested MR and PCC together, now even i passed the medical they still have to wait to see my criminality both from RCMP, USA (if applicable) and from home country has to be cleared. As u can understand these check varies from person to person (also no. of dependents in ur application) and thats probably the reason it takes different time duration for different applicant.
eCas update probably not directly connected to GCMS thats why whenever VO do any activity (like MR, RPRF or PPR) its not automatically gets updated. Also they probably do not take it very very seriously since they knows that they r directly contacting with the applicant and he/she already aware of their status. This is an assumption though.
