Nawaz left Pakistan for London on November 19, 2019 whereas the voting on the extension on the army chief took on Jan 8, 2020.
Answer to your first question: Why did Army bring Imran Khan by rigging election instead of their own Pervez Musharraf?
Answer to your 2nd question: When opposition came to know it was Army brought IK to power? In your views, Army given relief to Nawaz anticipating there will be vote in NA for the extension of COAS and PMLN will vote despite knowing Army brought IK to power. Did Army give this deal only to PMLN or other parties as well that in future if anyone sentenced to jail on corruption will be let go to London for treatment?
Last thing, please provide few suggestions to make free and fair elections.