Don't think you have the emmc problem. Normally you will not have model # show up in odin, and there will be a pit file error... you have neither. I also wouldn't try to do the pit file from that thread, you don't have that problem.
What I would do... try the heimdall suggestion from that thread or try a different version of odin. Since you have knox showing in odin, the only file you can use is the MK7 which I guess you got from sammobile. And to you question of getting bootloader, that is included with the factory file you have flashed, so you don't need to do that.
I know you tried already to flash TWRP, but maybe try another version of that too? I would try the latest 2.7.2.0 or 2.6.0.3 or any others. Or maybe try philz recovery, different versions?
If all else fails, you can try to send it to mobiletechvideos, they may be able to bring it back.
good luck