No need to be sorry!
You are right,some animations are missing "weights",that seems to be the problem with scaled bones.And you are also right,that it's not easy to attache the bones to a existing model.For a lot of models it will be unpossible,but also for a lot not.
I think however,correct me if I'm wrong,that you never will get such animation-results (I mean only the bones for the moment)with Blender or MED.But I have to say,that I have no knowledge about Blender.
I knew the tip with BvHacker and tested it,but for me and what I did,Fragmotion was easier to use.