Sonowal's name as the party's face came as no surprise as he came with a clean image and no baggage and enjoyed the confidence of Prime Minister Narendra Modi.
Kumar's comments at the party's national executive meeting came amid a strain in his ties with the Bharatiya Janata Party and appears to be a message to his ally, some of whose leaders have been linked to alleged communal tensions and violence in the state.
'As demonetisation showed us, the Shah-Modi duo can take big risks.' 'Risking economic damage for political benefit, however, is one thing, stoking old fires in complicated Assam is another', warns Shekhar Gupta.
'There is a design of fundamentalists that the north east must become an Islamic country.'
'The win in Assam is likely to have a ripple effect in other north-eastern states like Manipur and Nagaland which have been reluctant to embrace the BJP in the past,' says Nitin A Gokhale, the distinguished commentator on strategic affairs, who lived and reported from Assam between 1983 and 2006.