Fighter, I think you may have misunderstood Zaet's post. If I understood what he was saying properly then what he meant was that if you believe you are the strongest then in your world you are, but in the real world (where the annoying cell-phone you throw does not go through the wall) you may not be.
I believe there is no strongest either. It may be true that the chain ends somewhere, but strength must also be measured by intelligence, wisdom, skill, etc. Brute strength (both physical and magical) is essentially useless if you don't know how to use it properly.
I should also add that if there is someone who is better then everyone else, I doubt he/she would be on this site. I doubt a person with that power would have much use for the internet. I also believe if anyone comes on here claiming to be the strongest, or the wisest, or the most intelligent because they are something more then human, they are either attention-whores or role-players and misunderstand the purpose of this site.