Link : Reservations and Tamilnadu
Read this link (extremely informative) about the TN quota system.
The recent SC judgement about the SC/ST quota is only for promotions. It only says that when it comes to promotions a rich SC must make way for a poor SC. How on earth can anyone oppose that ? Under no circumstances will a non-SC candidate have access to the reserved promotion (ie. roster position). So, other castes have no role to play in this.
The judgement is available here. Please read it and you will be amazed at how studied and well written this judgement is. We live in the age of the internet – why read the media when you can directly read the judgement online ?