Actually, even a single ship can have refits. Like I said, there was a shield upgrade. There was also a boom phaser upgrade. The original D7H had Ph2s on the boom and rear/side-rear shields in the teens; the D7H with a refit has Ph1s on the boom and the shields go up to 20 on the aft, I believe. The Taldren stock D7H had Ph1s and shields were too high at 22. The pre-refit version wasn't there at all. Now there will be 2 versions if FS has made the changes I think he did. Anyway, it's a minor point. After that, we essentially get one extra ship nobody will use.