Why is India Seeking 26/11 Accused Tahawwur Rana's Custody?

If Tahawwur Rana pills the beans, it could provide clinching evidence of the Pakistan Deep State’s involvement in planning the 26/11 attacks.In case Rana is extradited, the NIA, the investigation agency in this case, will get his custody. Rana is also a prime link between terror organisations LeT, Jamat-Ud-Dawa and the Pakistan Army