I don't really see anything unusual about the ready cas or anything else in the graphs. The graphs show exactly what you would expect - and the moving graphs make a nice cartoon to explain what is happening.
Basically the graph shows that KCC load the machine with the ready cases. You can see the jump in KCC activity just after the VB dates - I.e. KCC arranging the interviews for the next batch of current cases - which the graph shows is activity that has an initial surge and then continues for a couple of weeks.
The the updates to other statuses is the work being performed by the embassies. The issued line is moving in a nice progression - exactly as you would hope as they eat their way through the ready cases that KCC is throwing into the grinder.
Am I missing something?
I noticed the ready case are more exponential than the issued. This may be due to the 1-2 month delay between case going to the grinder, and cases getting approved 1-2 months later after interviews.
Another effect is that cases are indeed not in the system for the first few months