No matter the game - cheating, in my opinion, is in no way to be tolerated. Personally, I think that every cheated score should be removed from the HOF immediately. Fifo's score and actions are indeed pretty suspicious in my eyes; namely having the exact same score as Haruka, and constantly denying access to any proof.
HOWEVER:
There's also no actual proof for him having cheated yet. True, he IS pretty suspicious, and I can see where you others are coming from, but as long as he's not proven guilty, it wouldn't hurt to at least CONSIDER the possibility that he got his score legitly. Thanks to his actions, I don't quite believe that myself, but I'm mainly saying that because some seem to have already decided that he's been cheating - WITHOUT solid proof.
And Fifo: If you care about the HOF and your tings that much, surely it would be worth a few minutes to actually prove that you did not commit to cheating.
I believe in the good side of humanity, so I trust you to do the right decision:
If you are guilty, be a good guy - and admit it.
If you are not guilty, be a good guy - and prove it.
Just my point of view on that matter... Sorry if that came out overly dramatic.