Hi,
I would like to clarify that under JATC standard membership 1 year, you can download all available and upcoming JA Joomla templates and complimentary extensions built in only.
For JA Rave, we just support styling for JA Comment component to get ready for running on our JA Rave template only. That does not mean you can download/use such extensions in thte quickstart package. Please refer the release news via: http://www.joomlart.com/joomla/templates/ja-rave to know more about the list of complimentary extensions built in JA Rave templates package and you will see that JA Comment is not included in this list.
In order to download JA Comment component, JAEC extensions club is required.