I am also looking to migrate my dolphin database as well. I opened a ticket and basically they told me the dolphin database needs to be in the chameleon database and that was it...nothing else. I sent them a response as to how, and that was about 4 days ago. nothing. So, I suspect only the dolphin profile and picture tables needs to be imported into the Chameleon database. The import script in the Admin area would somehow pick up that particular path and go from there.
If I figure this out, I'll be sure to post the how to back here.