I've exchanges a few e-mails with Sam so far, and he does seem like a very nice fellow. But then, he would have to be to put up with all of my fussy questions.

I'm pretty sure that you're correct about the iguana in question being one of Sebastian's siblings. Sam said that he was part of a group that started beating the crap out of each other as they got older. This one was the nicest of the bunch (only missing half of a toe), so he was priced the highest and is subsequently the last to go.