Why The Silence Over Aubameyang Transfer?

What is really wrong with Pierre-Emerick Aubameyang that's making him no target from the top European clubs? could it be his resilient obsession with Real Marid or just a mere arrogance? so many questions unanswered at the moment about him. some have blamed it on the fact that he's an African, that African players tend not to command the big money moves in European football transfers. while some are of the opinion he might just be hijacked by Chelsea in a black market fashion just as we know Arsene Wenger to be common of.