Well, who knows what their equity investment got them in terms of a financial stake in Delfin and any future stock. This could simply be an investment for them with some secondary benefits.
Either they want to also reserve the right to invest in and operate the ships directly, partake in the design and construction as you said, middleman deals like Hartree was supposed to, or maybe use a ship for their own Asia/Japan LNG efforts internally or for external partners they sell to.
I’m sure they didn’t do it for nothing and no one knows how much they invested
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