Well....there is a 100% chance that it is a scam ,thats the problem..
Where I was brung up, "chance" = "probability", so 100% chance = definitely without a doubt.
you will only know for sure that it's a scam when the dev has taken the money/BTC
What the dev could do to make everything more transparent is for instance use escrow and also tell everyone what his other alias here on bitcointalk is..
right now everybody is just trusting an nameless stranger with there hard earned BTC .. thats the part I don't get personally
I'd trust him with a small amount if I was an investor. But I'm a minor not an investor.