Afaics his abstract paper does not deal with some of the intricacies of the economics that have to be solved in order to make the design actually work in the real world.
You see that often in unseasoned theorists.
Someone asked me in a PM for my opinion of VanillaCoin. I just expended 15 minutes studying it for the first time:
https://bitcointalk.org/index.php?topic=977245.0The DarkPP stuff is vaporware and no details are available.
It claims some efficiency improvements over Bitcoin and Peercoin. Appears the developer is a seasoned P2P networking programmer. If I had to venture a guess, he probably was a former developer of a Bittorrent client.
The main feature of significance is the zero confirmation time research which attempts to gain a faster consensus. Unfortunately he seems to entirely forget any game theory analysis. The Byzantine fault tolerance in proof-of-work consensus is due to game theory incentives given by the proof-of-work rewards. He expects these peers to behave a certain optimum way when they are not being paid to do so. Many faults will be found in his design because of this. I don't have time to go outline the faults.
Satoshi was a lot more astute than many people might realize. If you are going to improve upon Satoshi's work, you need to be very sharp.