Spence activates rematch clause.

[Primo Carnera]

What happens in the rematch and what weight class will Crawford stipulate?

I thought I read somewhere (and I might be imagining it) that the loser gets to stipulate the weight? I reckon I have got it wrong because it obviously doesn’t sound right.
I understand Spence activating the rematch clause because it’s the best money fight out there for him.
But I think Crawford wins again , whichever weight it’s at because I think he was also looking at moving up.