(1) What we saw in the video was the drones killing terror suspects.
(2) What we saw in the video were the drones killing terror suspects.
(3) What we saw in the video was terror suspects being killed by the drones.
(4) What we saw in the video were terror suspects being killed by the drones.
The intended context is as follows. The we here saw a video that had been transmitted from the drones that had flown over terror suspects. In that video, you didn't see any of the drones. You only saw some terror suspects being killed by a bomb presumably fired from the drones.
In this context, are all of the above sentences natural?
If not, please tell me which is natural and which is not.
(5) In the video, we saw terror suspects being killed by bombs presumably dropped by the drones.
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(5) In the video, we saw terror suspects being killed by bombs presumably dropped by the drones.