No. 6 is typically for second new ball no?
That's another reason - he has the instinct of an opener, he plays them in LOs. Ideally, 6 is the spot where a 2nd opener should be slotted - if you study AUS cricket, they have 2 specialist slots in Test line-up : 3 & 6 for similar players and they did inter change players in those 2 slots - Ponting, Jones (Dean), Langer, comes to mind.
Fakhar should be at 5 actually, because Asad is holding on to #6 well. Here, the reason to suggest him at 5/6 was because of his spin playing capacity, besides, after 80 overs, pacers often don't have that sting with their short balls.