yeh I don't think we need that much this window, really. We have to plan for future.
In the summer our strikerforce will be Kone, Vellios, Gueye, Mirallas and Naismith.
3 of those are wide players more than strikers, of the other 2 one may not even be a premier leauge standard player ever let alone next year. The other simply isn't good enough to be first choice for a side with top ten ambitions. So there is a gap there for a really good striker. Probably two.
I haven't seen Batshuayi play, but he has a decent enough scoring record and seems like he would be a good signing. Will he be good enough to lead the line next August? Probably not, even if he has the talent to so in the future.
So we probably need someone else on top of that. But for this window if we sign him, we can get by with him, lukaku, mirallas until the summer.