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言葉とは裏腹にテレザの声は冷たい。雪の女王のような面差しが、今は真実凍りつくようだ。
貴方の前ではそうとしか在れないとテレザは言って、そう在ってほしいと自分は望んだ。
許される幻影など、自分には永劫相応しくないから。
「代わりにはなり得ません。誰も彼も。人は常に、その人唯一の存在でございますれば」
フレデリカが淡々と言う。
「それでも、人は清算を求めるものであろ。それがどのような形であれ」
86─エイティシックス─Ep.2 ─ラン・スルー・ザ・バトルフロント─〈上〉 安里アサト
How should I understand the bold sentence? Is it equivalent to, say, 他の人にとっては、その人が常に唯一の存在であるので?
I think you are right. Basically it says '(I) cannot be a replacement. Nobody. Because a person is always a unique existence''.
I feel その人 is a bit wrongly inserted, but it can be understood as being used in the same way as その人独自 'his/her unique/original'. So more literally その人唯一の存在 is her original, unique existence.
ございますれば is a double punch of archaic speech. First, polite ます's 仮定形, ますれば is effectively obsolete, as we don't insert a polite marker in a clause led by れば. When a politer conditional is needed, we use ましたら instead. Second, the れば is not "if" but a remnant of old 已然形 sense "since, because". The dictionary says:
４ 文語で已然形に付く。
㋐原因・理由となる条件を示す。…ので。…だから。
This reading is only valid today in few idiomatic phrases, namely なれば (=であるので, なので) and ますれば (=ますので), both sound fairly quaint. Otherwise this kind of expression would never be used lest be confused with normal 仮定形 sense.
As for the interpretation of this sentence, その人唯一の存在 is a little problematic. Under this context, it is most naturally understood as "the unique existence of oneself", but the N唯一 formula in principle should tell "only one that N has": 東京唯一の支店 "the only branch in Tokyo", 彼唯一のアルバム "his only album". In this light, the sentence may also be able to be read "because a person is always the only one for someone".
