JMB kingpins in a sub-jail
The sole reason for keeping the JMB leaders in a sub-jail, as it seems to me, is to prevent them from talking to other inmates about their sources who provided them financial and logistic support.
While some of the murderers of Bangabandhu are in the central jail, the present government is allowing a parallel prison system for a selected few.
I do not think this government is capable of bringing these terrorists to justice.