Here’s “the guy” again with his spoiler review of TLJ:
https://www.youtube.com/watch?v=vOdobc7jtQo
He asks a good question, that I actually had not considered (and neither did RJ apparently): if admiral Holdo can lightspeed through Snoke’s ship to allow the rebels to escape, and we know they’re going pick them off one by one once the chase begins at the start of the film, why didn’t any of the rebels (or better yet a droid) sacrifice themselves at the beginning of the plot by having one of the cruisers lightspeed through Snokes ship, such that everyone can escape?
The only reason Holdo was able to carry out her plan is because the first order had ignored the cruiser as they were fully concentrated on destroying the shuttles. She was able to turn the ship around which, if they had done that earlier, they would be in full range of the first order weapons and would have been blasted out of the sky before they could do anything. And, to the question “why didn’t a droid do it”, well its clear in the film that her original plan was to just keep the chase going while the shuttles escape unnoticed. But, as soon as the first order started destroying the shuttles , she had to think fast and come up with something. Would a droid come up with a plan like that? Not unless it was a tactical military droid. And you have to remember that this is a film. Having a droid sacrifice itself wouldn’t have had the emotional weight of a human sacrificing themselves.
Why not use one of the other ships? Well the Calamari cruiser was a LOT bigger than their other two ships. The other ships probably wouldn’t have done much damage to snokes ship and fighters would have done nothing.