Interesting one this. As Prog rock is generally termed as "a mostly British attempt to elevate rock music to new levels of artistic credibility", and given that it almost certainly developed out of 60's psychedelic music, I'd say you had a good point there.
If we take prog as being something that drew from many diverse influences, and attempted to break the boundaries of what was thought of as 'normal' rock/pop music, then most of the list above would qualify. However, I've never thought that just the use of an odd instrument, and the ocassional obscure lyric qualified a song to be psychedelic. So I wouldn't include Norwegian Wood in there. And I'm not sure of 8, 9, and 10 on the list, but the rest would appear to qualify as possibly the beginnings of prog.
Of course, The Beatles weren't the only one's experimenting with new sounds and song structures at the time.