Some people are on Stock rooted MJA. They did this with activating the Knox flag. But have a working recovery.
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I guess I'll have to reed much more about it before I dive into it..
I won't try 4.3 until I'm positive i can get back to 4.2 any time I want.
Kernel source is downloaded and I would look for stock boot.img to pull the ramdisk from it.
and build first kernel with the stock ramdisk.
I didn't have internet for about a week and as it looks I missed a lot in that week.
Now I have a lot of reading to do and a lot of catching up...
Edit: I think I'll wait before flashing 4.3. I don't like this "No, first of all this does not include firmware like the bootloader. Second of all, you cannot get rid of the Knox bootloader once it is installed. Not even with Odin."
So I'll wait before even trying anything....