The injunction was because some morphine tablets last year were made the wrong size...bigger..and could poison patients not able to handle the large dose.

This led to an inspection of the manufacturing facilities which were found lacking. Eventually ALL products were discontinued, some recalled at the wholesale level but not from patients.

The oxycodone shortage has to do with not enough released by the DEA for that time period. Every control has a yearly quota. Sometimes it is not enough. Ritalin had this happen many years ago for example. The raw powders are shipped according to FDA allotments yearly. Some people who are conspiracy oriented are blaming the government for being anti pain control and doing it on purpose. I don't think that is likely since it has happened before, just not commonly.

The KV issue may have led to more oxycodone from other companies being used up faster, but I don't think that is the reason it is short now.
KV will probably not be making it for a while. But ALL companies ran out eventually.

When Schering recalled all albuterol inhalers, there was a shortage of that too, years ago.

Sometimes shortages occur when a patent is sold, and another company starts making it. But not always everytime.