Easiest way to get rooted on 4.4.2 on a locked bootloader is to roll back to 4.2.2, root 4.2.2, install a recovery manger such as XZR then flash the ROM, connect to a computer and use flash tool to flash the kernel. Boot and have fun!
Sent from my C6606 on 4.4.2 KitKat
Asus Transformer TF101 4.4.3 KatKiss ROM
Sony Xperia Z C6606 Android 4.4.2 Stock ROOTED
-Win 7 Pro