Kane said:When Superman realizes that Brainiac was deceiving him the whole time, like in the STAS episode 'Stolen Memories' (Brainiacs debut).
Superman should realize Brainiac's dangerous intentions midway through the film so it build up the suspense of him as a villian till the end.....the final confrontation.
I doubt Singer will use Brainiac in action 2 times.
Ok, just imagine, what if we get Brainiac in action only at the end, what will be reasons of another action sequences???