We were finding with the first person samples that people were then going on to make many rich and varied errors on their arrival posts-- so we figured, combine the arrival post with the first person speech by giving it a 5 line speech requirement. That way we can quality control the arrival posts and make sure the voice is down all at the same time!

And we figured also that people have to do their arrival posts sometime anyway, so it's not really extra work-- as they'd also have to do the 3rd person sample in any case.

Hope that clears that up for you! :)