Upon rewatch, Steve's "I knew" definitely sounded to me as if he was admitting that he figured out Bucky was the one HYDRA had kill the Starks, even if he had no proof.
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I'm with Matt, Steve had to suspect, because Zola was definitely hinting hard about connections.
So were the other Winter Soldiers activated? Or were they being held in reserve?
I also thought Steve knew (or strongly suspected) that Bucky killed Howard and Maria.
Matt, after two watches, I'm still going with didn't want to know for sure, even if he knew on some level, and intentionally didn't poke it with a stick.
Also, that he's admitting that to himself as much as to Tony.
Threepeat
It seems to tie into what he said in the letter, y'know? Also, man. I am so impressed with how they set things up, no matter what the specific intent was there. The reminder after things have gone south but before they have hit the point of no turning back, penguins at the gate south, that Howard was Steve's friend as well as Tony's dad. So much stuff in every line.
I thought Steve was admitting that he'd known Bucky did it.
The other Winter Soldiers were killed by Zola in their cryo-sleep. Pretty sure I saw bullet holes in them.
Yeah Zola killed them, but I wondered if they'd been out in the world like Bucky.
Ooh, good question. I thought they hadn't but I don't know what I based that on. I felt kinda sad for them that they'd gone to sleep with such high hopes for being murder machines and then never got to wake up to their destinies, but really I just felt like it was a waste of scary characters.
When Zemo said "They died in their sleep" I thought "Oh, cryo failure, poor things." Then they showed the wounds.
It is kind of weird to feel sorry for them. But maybe they weren't as stable as Bucky--for a given definition of stable. They did go nuts, and that one guy made Bucky get him out of there. Perhaps that fic favorite of trying to reproduce what happened to Bucky and it failing .
edited because of too many villain Z names.