You did your due diligence and now ball is in their court! Forget about the worst case.wosrt case may be - IRCC don't send AL before Jan 31 which is the date of extended med expiry date, how can I justify my PR status...
Real worst case would be people not replying to this email and then they don't hear from IRCC again for a long time. Later they gonna regret that they should have replied to this email.