Imports were increased, because Pakistan's per capita income was increased.
If you check the industry and service sector during the great Musharraf time, there was also rapid growth.
Before Musharraf internet was limited to 3 cities, Lahore had one engineering uni. and Islamabad had non, look what he did to the education sector, whereas Imran Khan is doing cuts in education sector and even closing down quality institutes in private sector.
Musharraf made Pakistan's defense invincible, where as Imran Khan is doing cuts there as well, while soldiers are dying because lack of armored vehicles.
Great Musharraf got rid of circular debt and implemented plan to clean Pakistan from debts, but comes the idiot Imran khan with the other 2 idiots you mentioned. Working on the agenda of foreign agencies, idiot Imran Khan made alliance with the exiled idiots (as you mentioned) and named it APDMA and than all together they come to streets of Pakistan making lame excuses, such as... democracy etc.
Even in past senate elections, idiot Imran Khan made deal with PPP to elect anti state elements as chairman.
Look what become of Pakistan without Musharraf.