D. azureus a morph of D. tinctorius?

[AJS822]

I am doing some research and came across conflicting opinions on whether azureus and tinctorius are the same species or not based upon new findings. This is the article I recently came across, and would like some input on breeders feelings on this article http://bnoonan.uta.edu/Researchpage/Wollenberg06.pdf

The author basically states in his conclusion that azureus and tinctorius are the same species whereas tinctorius, being the older name, will remain, making azureus another morph of the tinctorius species:

"Our results suggest that the variants assigned
to D. tinctorius and D. azureus represent one
evolutionary lineage, to which we assign joint
species status. In principle, we herein follow the
evolutionary species concept (cf. Simpson, 1961;
Wiley, 1981), which defines species as evolutionary
lineages over time. However, the studied
populations of D. tinctorius and D. azureus also
form a homogeneous segment of populationlevel
lineages and therefore match the definition
of a species under the general lineage concept of
species (de Queiroz, 1998). "