Once the blue-eyed bureaucrat of former HRD Minister Arjun Singh,Joint Secretary in the ministry Sunil Kumar is said to have also left quite an impression on the new minister,Kapil Sibal. Kumar has already been given a three- month extension although the tenure of his deputation in Delhi is over. The buzz is that he may be asked to stay on or may even bag an Additional Secretary post as his in-depth knowledge about the education sector is quite useful.