I cant give you a justification, but I can give you my interpretation, as a practising psychiatrist.
1. I need to put my own imprint on this team now that I have taken over.
2. I skippered the guys in their thirties and they are loyal to me.
3. I will even add Imran Khan to the squad: he always did a job for me in the UAE.
4. Im culling all the younger guys who were loyal to Arthur. Bye bye Shadab and Faheem, Ill bench Abbas (whom I never picked til just before I retired.) Im also keeping out the 20-somethings who are friends with the Arthur loyalists of the same age. And Rahat, whom Arthur rated.
5. Im going to pad out the team with youngsters so I look progressive and dynamic: Naseem can be the third seamer behind Shaheen and Imran. And Musa wont actually have to play.
6. So my attack is a pair of world class youngsters (Shaheen and Naseem) plus two players whom Ive always trusted (Yasir and Imran).
7. What could possibly go wrong? Its not like Yasir might fail again. Its not like Imran might fail again.
Too many conspiracy theories to be honest.
I do not like misbah the cricketer and now i also do not like misbah the coach but i have mothing personal against misbah and by all accounts misbah is a thoroughly decent human being!
This is my take on why musa was selected.
Just before mickey arthur's contract ended, the test bowlers for pakistan were
Amir
Wahab
Abbas
Shaheen
Hasan ali
Amir and wahab retired suddenly.
Hasan is injured.
So only shaheen and abbas are available to misbah.
Who is in domestics that misbah can select
Imran khan snr
Ehsan adil
These two he knows and have played with him for pakistan. Imran was successful and eshan wasnt.
So misbah goes back to what he knows worked and picked imran.
So far we have
Shaheen
Abbas
Imran
Misbah needs at least 2 more pacers, he gos back to the domestics, but he does not rate any of the established bowlers , remembering that misbah was playing for pak less than3 years ago and knows the established bowlers from 3 year back.
So misbah inquires who are the best new fast bowlers to play in domestics in the last 3 years and is told that the new fast bowlers in domestics are
Naseem shah
Musa khan
M. Hasnain
Being familiar with hasnain from the world cup just ended, musbah decides to try out the new boys because he knows that there is no one in domestics apart from these boys. So misbah selects hasnain for t20s as he is already playing odis for pak. That leaves naseem and musa. Misbah selects these two for the aussie tests.
To be fair to misbah, he is not too wrong, there is not much in domestics when it comes to fast bowlers, he can really only try these 3 and if they fail as well, its pretty much game over for pak fast bowling for the moment, until a new batch of bowlers break through.
The only 3 bowlers misbah could really of selected were:
Eshan adil(who had failed under misbah)
Sameen gul
Haris rauf
And thats my take on the situation