True, but both saw a man fitting Oswald's description in the TSBD's SE corner 6th floor window seconds before the limo arrived in Dealey Plaza. Within no more than 30 seconds of that, the shooting took place, and numerous witnesses saw a rifle in the window.
If you want someone who actually saw the rifle just after the shooting, one such witness would be Bob Jackson.
http://mcadams.posc.mu.edu/russ/m_j_russ/jackson.htm
Mr. JACKSON - ... And as we heard the first shot, I believe it was Tom Dillard from the Dallas News who made some remark as to that sounding like a firecracker, and it could have been somebody else who said that. But someone else did speak up and make that comment and before he actually the sentence we heard the other two shots. Then we realized or we thought it was gunfire, and then we could not at that point see the President's car. We were still moving slowly, and after the third shot the second two shots seemed much closer together than the first shot, than they were to the first shot. Then after the last shot, I guess all of us were just looking all around and I just looked straight up ahead of me which would have been looking at the School Book Depository and I noticed two Negro men in a window straining to see directly above them, and my eyes followed right on up to the window above them and
I saw the rifle, or what looked like a rifle approximately half of weapon, I guess I saw. and just looked at it, it was drawn fairly slowly back into the building, and I saw no one in the window with it. I didn't even see a form in the window.
Mr. SPECTER - What did you do next?
Mr. JACKSON - I said "
There is the gun," or it came from that window. I tried to point it out. But by the time the other people looked up, of course, it was gone, and about that time, we were beginning to turn the corner.
Mr. SPECTER - Which corner were you beginning to turn?
Mr. JACKSON - Houston onto Elm.
Mr. SPECTER - I now show you a photograph marked as Commission Exhibit No. 348 and ask you if you can identify what that depicts?
Mr. JACKSON - This is the School Book Depository. This is the window the two colored men were looking out of.
This is the window where the rifle was.
Jackson only saw the rifle from his angle, not the shooter. But clearly the rifle seen by Jackson was held by someone, and just as clearly the man that was seen by Fischer and Edwards in the southeast corner window of the sixth floor was the same man that was holding the rifle that was seen about 40 seconds later by Bob Jackson.
Surely you are not going to argue that an innocent man left that window and a guilty man took his place in the short time between the Fischer and Edwards sightings of the man in the window and the Jackson sighting of the rifle.
If not, and I trust not, then the man seen by Fischer and Edwards is the same man holding the rifle seen by Jackson. That man fit Oswald's description.
But the conclusion is inescapable -- the shooter in the TSBD SE corner window was seen. By Fischer and Edwards. And others.
Your statement is false, that the shooter in the TSBD was unseen. He was seen, and clearly described. On the other hand, there is absolutely no first-day evidence of a grassy knoll shooter.
Hank