> あの人はいい人はいい **だった** けれど頑固だったね

I think I understand that だった but Im not completly sure, is it implied that
Its refering to 人? Can you say よかった instead?
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2019-06-06T15:31:39.593
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2019-06-06T16:07:53.110
2019-06-06T16:07:53.110
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question
grammar
Understanding the use of だった in this sentece