Reason for Shiv Sena's actions

BJP has lost its higher caste Hindu following in UP and Bihar. Shiv Sena has lost its Marathi Manoos campaign to MNS. They need the local people's support for survival in these 2 states. Bal Thackarey, with his attacks on North Indians, is trying to get his Marathi support base intact. BJP, by going against their oldest political partner, is trying to woo popular support in UP and Bihar. But don't think there will be a political seperation between BJP and SS as this is preplanned and the primary motive is something different.
BJP has always been against Article 370 which gurantees special status to Jammu and Kashmir. Their logic is J&K, being a part of India, should not get a special status. Now, with SS raising the "Mumbai for Marathi" slogan and BJP opposing it, we might soon see BJP saying the same logic that it is using for opposing SS in Mumbai, should be valid in J&K. So, either remove Article 370 altogether or accept SS's demand. Either way, BJP is to gain.