I personally disagree with the concept of 'bail' after conviction - the government should handle treatment of prisoners and they should still be in 'prison', albeit at a hospital in Pakistan (if necessary) with prison/police guards.
My sense is that these parts of the law in Pakistan (different class facilities in jails, bail after conviction etc) were put in place by the elites to cover their asses in case they had to go to prison. We need clarification and, if necessary, reforms in the laws to remove these anomalies.
@VCheng
Here's a commentary on a similar situation (accused granted post conviction bail):
https://www.dawn.com/news/1403403
That's where the delay is - Government, NAB, courts - all have a stake in this. The PTI appears to be wanting to make sure that due process is followed in granting NS permission to go abroad, hence the reference being forwarded to NAB.
Additionally, it appears that removing the name of a convict from the ECL is something that has to go in front of a cabinet committee for approval per the rules.