:::::::::Nick, Jaffrelot is a political scientist whose "specialism" is India and Pakistan, as opposed to, say, the UK or Germany. His output has been used for articles discussing the development of caste associations etc, not just Hindu nationalism. However, even if you choose to narrow the scope then it still applies to Modi because he discusses Modi and Modi is/was apparently a member of the RSS, which I'm pretty sure most people would consider to be a Hindutva organisation. If you will now only accept sources that are experts on Modi then this is going to be a very short article. Like, a paragraph.-