without new info we will go around circles
To a certain extent no news also conveys information. Up till now I was more inclined to assume some structural failure on this fairly high cycle/hour airframe (with a history of tail scrape damage), mainly on account of no claim of responsibility for the downing.
However the longer the investigators keep silent (and this is an Egyptian led investigation, all other parties are subordinates), the more likely it is that they already know just do not admit that foul play was involved. The door panel with apparent shrapnel damage pointed out today also swings the pendulum in this direction.