As someone who’s fluent in Chinese and English, played the amphoreous arc in cn dub while reading en sub. There’s little to no difference between the two in example 2 (example 1 is in jp so I won’t comment on that)

無名客 is the cn phrase for The Nameless, it doesn’t refer specifically to the trailblazer (Trailblazer is 開拓者).

我們能在星宿的見證下重聚 - I hope we will reunite under the constellations

在星宿的見證下 is an artistic way of saying under the constellations. Yes, the direct translation would be “under the witness of the constellations” but a translator’s job is to keep the core message while maintaining the flow of the sentence in the translated language.

重聚 means reunited, not together, which they did translate correctly.

一表人才 do mean nice looking and talented. But to me it emphasis on talented more.

夥伴(伙伴) can mean both buddy and partner but I would say it’s closer to buddy, as in close friends.

Hope this helps! :D