I haven't gone through every detail here but I've been suspicious of pocketdice.io for a while now.

Hopefully this will only serve as encouragement for them to prove me wrong, but, I believe they are closely related to btc-casino.io

Cliffs on btc-casino.io:
Russian based casino that uses mostly or entirely hacked/pirated software from pretty much every provider you can think of and is also guilty of plenty of other scumminess that would make FortuneJack or Betcoin.ag seem as if they were run by Jesus, Satoshi and Dooglus.  I've been calling them out for months in this thread.
There's also this article about them.

CoinProfit.io is an affiliate program that offered only btc-casino.io for a year or more until pocketdice.io launched.

I am pretty confident that Coinprofit.io and btc-casino.io are the same people.
I think pocket-dice has a different forum rep but likely are tied to the same Russian (or nearby) group.

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@Pocketdice

You're investigating one provably fair, pretty simple dice game, right?  That does not take days.

It looks like you are trying desperately to find any possible excuse to not pay the player and stalling to feel out how much your image would suffer if you just ignored him.
Hopefully it's just taking some time to come up with 100+ btc.

If you aren't going to pay this player don't expect the old "we found fraud, but can't share the details for security reasons" trick to accomplish anything.