Hard to tell, TBH. More of a squad player due to Kevin Großkreutz and Jojic occupying a spot in AM (though Jojic was mainly bought because of his abilities on the no.8 (= Gündogan successor!); his AM qualities were "just" a nice surplus).
Since BVB monitored him for about 1.5 years and had approached him in December 2012, he was for sure no spontaneous buy but a conscious decision.
Klopp explained last summer why he bought Aubame - because he's fast and been a goal threat in the French league, scoring from shots, volley shots, headers, set-pieces, ... Klopp had also mentioned that Aubame's challenge will be similar to the one Kuba had to master a couple of years ago: To not just wait high on the pitch for being fed with passes or to counter attack but to learn ho wo defend well,to learn
gegenpressing, and to become comfortable within tight spaces. Aubame has done quite well given that he came from a foreign league and from a team with a very different philosophy (and no CL football) but there's quite some room for improvement.
OTOH, if you look at his statistics, he's much better than many Dortmund fans perceive. For example, he gave us nine times the lead this Bundesliga season - more often than any other BVB player. Before yesterday's match, he also had a slightly better shot accuracy and conversion rate than Lewandowski, Reus, or Mkhitaryan. Ask most Dortmund fans and they wouldn't believe those numbers.