No, EBS is a product and Weblogic integral part of it.
What exactly you want to achieve without weblogic?
answer is no .
If you just want to run concurrent request from backend , yes it is possible . Because concurrent processing doesn't depends on weblogic .
But you still need to have weblogic installed and configured . Only thing is you don't need to start it
But all middletier components like OAF pages , forms etc runs as managed servers in R12.2
So they require weblogic servers
You can check more from below document
I am bit curious to know the reason behind this question