Ebolavirus is just one species.  There are different isolates from different outbreaks, such as Ebolavirus_Sudan and Ebolavirus_Reston and Eboloavirus_Sierra_Leone.  Ebolavirus is one species of Filovirus genus which includes Marburg virus and Cuevavirus. 

http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Undef&id=11266&lvl=3&lin=f&keep=1&srchmode=1&unlock

http://hfv.lanl.gov/content/sequence/HFV/ToolsOutline.html

Some neutralizing antibodies could be cross protective for all strains in the Ebolavirus species, but some are likely to be protective for only a subset of the strains or isolates in the Ebolavirus species.  Each polyclonal sera or monoclonal antibody has its own properties with regard to breadth of protection. 

http://hfv.lanl.gov/content/sequence/HFV/RESOURCES/Ebola_immunology_resources.html

Thank you for the link. Is it your work?

So, can you say the implications on the making of a vaccine are unpredictable?

How about when the virus mutates during an infection, could the antibodies become detrimental?