The only thing, you say he's hacking or ghosting off of one T kill.
For all we know, you were pulling a knife on him and he just happened to get you before you could get him.
I know this isn't the case, but there just isn't enough proof to truly say he's ghosting or hacking.
Also, if you're going to say he's ghosting, you could try to get a pict of his friends list and see if any of the other T's are his friends.
This could help tremendously with the Ghosting case.