Introduction: The top graphic is just one I pulled from a page describing the process of detecting cosmic curvature. The second graphic is one I drew up to illustrate my misunderstanding.
My assumptions are these:
1) The characteristic "teardrop" past light cone is a correct representation of our observations.
2) Curvature is measured by the angle between two converging photons.
3) WMAP measurements of $\Omega_0 = 1 $ are correct and accurate.
1) How is it conceivable that $\Omega_0 = 1$ from WMAP measurements if the teardrop past light cone admits initially parallel yet eventually converging photons?
It seems as if $\Omega_0 > 1$.
2) Photons live on the surface of light cones or teardrops and there is clearly some degree of curvature in the early universe as displayed by the graphic. If $\Omega_0 = 1$ then what exactly is meant by curvature if the curvature in the bottom graphic does not contribute to $\Omega_0$.
Keep in mind that the bottom graphic shows two dimensions of space and one of time. I have done my reading on FWR metrics to a reasonable extent and I am still lost with this so could one of you fine PSE users please show me specifically what I am misunderstanding and provide context, math or intuition.
Thanks in advance friends.