Look at that piece almost to the upper right, which is laid at a 90 degree angle from all the other pieces. No reason to do that unless to cap off the A, as it really is obstructing access to the topmost pieces when it lies like that. Likewise with the row to the left, why have a little break there and there in particular, if not to complete the strikethrough?Nice update, not sure that the layout of the track pieces is really the Avengers symbol. Looks to me like they placed the parts in organised groups following the shape of the lot available whist leaving enough space in between... As anybody would? Maybe I'm just not seeing it.
Do u have a source ?