The Irish defender has had a great start to the season after returning from an indifferent loan spell at Celtic.
"I've been really impressed," Potter said.
"I think since he's come back from a frustrating, disappointing and sad time for him up in Scotland, and he's realised how much he means to us here and vice versa.
"I think he knows he's in a good place, with good people around him that want to help him and he's taken massive steps.
"With Shane and his attributes, it makes him unique almost in terms of what he can bring to the team."
White's move to Arsenal was one of the summer's big transfer deals and Brighton have not obviously signed a replacement.
"It wasn't in our plans to be honest," Potter said when asked about whether Duffy's great comeback form was one of the reasons he was confident the Seagulls did not need to sign another defender.
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