Wouldn't it be logical for the 4th funnel to fall because of the break up?
I doubt it. If you think about it, these funnels were designed to withstand storms and rough sea conditions. A little inertia from the stern falling back isn’t enough to knock it over in my opinion.
Here’s what Dillon had to say about the fourth funnel:
Before the ship actually went down did you see her make any movements?
Yes, she took one final plunge and righted herself again.
She gave a plunge and righted herself again?
Yes.
Did you notice anything about the funnel?
Not then.
Did you afterwards notice something about the funnel?
Yes.
What?
When she went down.
Was that after you had left the ship?
Before I left the ship.
What did you notice?
Well, the funnel seemed to cant up towards me.
It seemed to fall aft?
Yes; it seemed to fall up this way.
Was that the aftermost funnel?
Yes.
Did you get the idea that the ship was breaking in two?
No.
Did the funnel seem to fall towards you?
Yes.
That is the after funnel?
Yes, my Lord.
Dillon says the fourth funnel did not move when the stern settled. Only until it “went down” did the funnel fall up towards him, and we see this perfectly animated in the recent THG animations.