3rd April 2011 Nucleosynthesis in the Big Bang

Today, I've been digging a little deeper into nucleosynthesis, and looking at exactly how each element was thought to have formed in the Big Bang.  Using this information


 from Wikipedia's page on nucleosynthesis, I drew the following diagram.  Where a neutron or proton is produced, it is written by the side of the fusion lines.  The short star pattern of lines is gamma radiation. Where a proton or neutron is used in the reaction, it is joined by a line.

 

As to the question posed in the diagram, this post discusses it but doesn't seem to come to any conclusion.