I knew those binding site inserts were hinky.
First thing I noticed when I did the blast run were those inserts.
Knew they were up to no good and were manmade...
You didn't know, you suspected, and we are no closer to knowing right now.
Also, I have read opinions of others that the "hiv-ebola" insert is not at all uncommon in other sources of natural genetic material -- even plant viruses -- presumably including the cleavage site.