Didn’t read all the thread, but I saw right away you mentioned Euclideon, just wanted to say, it was a scam, a big one. They advertised new and unique technology, able to do all sorts of things: especially animation. This last one - which is the most crucial when it comes to games and all dynamic situations - proved impossible for them - even though they said they had it done for 1year+ - and unfortunately, that brings the whole model down. Plus doing this in UE4 would require maybe 90% (?) being rewritten, so odds aren’t very big that this will be implemented 
Ps- I basically posted to trash Euclideon hah, wasn’t intentional, but it was a big disappointment.