I was hoping you'd type that. This is why Dash's instamine is so controversial. Because we know a few things:...We do not know who controlled 51% of the hashrate at the time. But, since we know that....
You feel free to turn yourself into a bitcointalk Columbo and spend the rest of your days trying to build a case that challenges the viability of the project or the integrity of its dev. For the rest of us, the easier route is check to see if:
(a) - the dev remained anonymous, dumped all his coins at the first all time high and then sloped off to a caribean island leaving his investors in the lurch
or
(b) - placed his identity in the public domain, remained with the project and turned himself into the hardest working coin developer on the planet while introducing a whole pile of successful innovations which were later priced in by the market to the tune of many hundreds of percent over the value after launch.