Gotze is a talent but one of my criticisms of AW is that the team struggles to vary their style of play because AW plays too many passing playmaker types with a linking CF = too many artists and not enough artisans.
If we're looking for an alternative to Mkhitaryan then IMO it could well depend on whom we sign at CF, and as to what style AW wants to mainly employ.
For mind Mkhitaryan combines the attributes of a winger, WF and playmaker & would work with both a linking CF like Giroud and a direct CF like Vardy.
Gotze seems more playmaker than WF or winger and would suit a possession passing game, whereas Mahrez / Carrasco / Bellarabi are more direct goal scoring wingers with more pace and perhaps provide better options and balance to the team.