Here is another example of how word endings of themselves don't make a difference to the actual meaning of a word in Koine Greek. (Amusing anecdote in last paragraph)
When my local KH were becoming more wary about supplying me with their literature (which could then be used against them), I started going to that old bloke who has his racks of Watchtower literature up at Town Hall Station, just at the entrance to the Queen Victoria Building (do you know him, Ozzie? He could have passed on by now - I haven't seen him for a while, some younger person or other old bloke is usually manning the stall now). I ordered the Kingdom Interlinear through him. When I went into town to get it he went out of his way to show me the great truths one could find by original language study. He showed me John 1:1 and proceeded to show me the difference between "ton theon" and "theos" - according to him, "ton theon" was Jehovah God and "theos" was the Lord Jesus Christ. The fact of the matter is that that particular argument was officially dropped by the Society around 30 years ago, IIRC (there was an article about it). The endings are simply case endings and have no material bearing on meanings - that argument would be like saying that "he" always refers to Jehovah God, while "him" always refers to the Lord Jesus Christ. (This isn't about the meaning of John 1:1, BTW, but how someone unfamiliar with Greek and its rules can find significance where there is none - the other thread on Koine was about the differences between "oikia" and "oikos" and the different inflections thereof)
Anyway, this guy was pointing to the verses and passages he wanted me to take special note of. When I got on the train home and had a look at the book, I noticed some brown, oily stains where he'd pointed to parts of the book. I can only assume they must be ear wax; he must have given his ears a good old clean before I turned up! I was rather disconcerted, to say the least...
Q: How do you know a Dub loyal to "Jehovah's Organisation" is lying?
A: Their lips are moving.