Sizemore’s monologue

Yes, it was Sizemore's writing and Sizemore's speech and he took those words to his grave while sparing Hector. It was a surprise, and although it seemed out of character, I was able to believe it enough. It was as if Sizemore had seen the apocalypse coming and finally wanted to go out on his own terms.

You're right, I think that was the speech that got interrupted by the idiot tourist shooting Hector. What we've seen from Lee over the course of the season is him getting more and more disgusted with his own selfishness and cowardice. It was not an unbelievable turn of events to see Lee decide he was going to do one brave and selfless thing before he died.

I think I got a speck of dust in my eye when he jumped out and began reciting that speech.

A big part of me wishes that Sizemore accidentally gets picked up with the hosts and because he's still barely alive, Felix and Sylvester can make a host version of him. It's not gonna happen but I can still dream.

IIRC, he had based Maeve on a woman he loved and lost and Hector on himself (or at least the man he wanted to be). I think that by the time Maeve is shot the first time, he is very distraught because he's fallen in love with her. In the end, by reciting that speech while Maeve escapes he has finally become the man he imagined himself to be when he wrote Hector's lines.

I disliked that his sacrifice was fairly meaningless. The hosts had already gotten away at the point where he exposed himself to the fusillade.