No it will not grow back... Im not sure what u mean my u attempted to Top the plant... sounds like u succeeded quite well in doing so. There's only one place a that new growth comes from and its nodes. Expect the two top branches to have all the new growth. Not really a problem depending on how much u cut off, u will just have two smaller top colas instead of one big one. Topping is a good way to promote Bush growth to keep height down. But your only supposed to trim off the tippy top, and dont do it while flowering, plants take 1-2weeks to recover from cuttings.