http://www.ncbi.nlm.nih.gov/pubmed/24860690
This was the most helpful phylogeny paper for me.
It still shows a different branch than Reston.
HOWEVER, that’s sequence identity over the whole genome. I wonder how different the sequence from the pneumovirus analog ElenaM mentioned is for its homologues in Reston and Zebola Guinea.
If that protein were to be involved in airborne transmission that could be expected to show similarity at least between Reston and Zebola Guinea.
The phylogenetic analysis of the five ebolavirus species here does not substantially improve on that presented by Baize et al. in that even when partitioning the alignment into coding and non-coding regions we get inconsistent rooting positions for the EBOV clade. We believe that at present no suitable outgroup sequences to root the EBOV phylogeny exist and that a temporal rooting gives the most consistent results.
This approach indicates that the outbreak in Guinea is likely caused by a Zaire ebolavirus lineage that has spread from Central Africa into Guinea and West Africa in recent decades, and does not represent the emergence of a divergent and endemic virus.
As the GP sequences show, without more diverse sequences, especially those from the animal reservoir, it is difficult to narrow down the estimates of when and through what means the Central African EBOV lineage has been introduced into West Africa.
I haven't located any information on the analogous pneumoviridae protein or comparison with the Ebola version. If you find something please share.