So NAB has won the first trick to 'save' its FATHER, NS.
You'd see that in coming days, NAB will only try to make JIT investigation 'controversial' by interviewing JIT members and by interpreting their interviews in their own way. YOU WILL SEE that soon after the interviews, NAB will come up with a view that there statements don't match and there are serious inconsistencies.
Save my words for that time. Although, I would be more than happy if my above-given apprehensions don't come true...yet this is what I see behind NAB's trick of interviewing JIT members.