When Buffalo begins working on the file, they send the AOR, and along with it Buffalo usually sends bar codes to be attached to any further correspondence or information requested from you.
The "Decision Made" is regarding the sponsorship approval. The next eCAS update will be "in process" from Buffalo.
Once they have reviewed your file, if they need any further information, or wish to schedule an interview, you will be advised.
If they initially conclude that further documents or an interview will not be necessary, you might be so advised.
When all processing (including any interviews) is done, then it will be Decision Made, with a passport request if the decision is positive.