You miss-interpreted what I said!
Blubrry Statistics are exact numbers of MEDIA DOWNLOADS - When someone commits to downloading your podcast, they are for sure either listening to it or syncing it to their iPod or iPhone. this is an exact number of who listend to that particular media file (episode)
FeedBurner measures FEED SUBSCRIPTIONS - When someone subscribes to your podcast in iTunes, they subscribe to your feed. They get the latest episode when your feed updates in iTunes. If say 100 people are subscribed to your podcast through iTunes on their iPhone for example, iTunes pulls your feed once and propagates the info to all 100 of the folks subscribed to your podcast. When They get that info, the media file associate to that episode is then downloaded from your web site (or where ever your media file is hosted) to that iPhone/iPod. That media download that those 100 folks make is what Blubrry measures. And technically, your 100 subscribers may see that you have a new episode, but if they never click play/download, they never technically listened to your podcast, thus Blubrry never registered the download (because it never happened).
To recap:
Web Statistics - Data gathered when users visit your web site
Feed Statistics - Data gathered when users are subscribed to your feed (See my first post why this subscription data is not accurate)
Media Statistics - Data gathered when the media is purposely downloaded (this is exact data). Furthermore, this is measured both for you web traffic and your feed subscribers (because downloading the media is a separate process that happens at a different instance of time than the HTML web page load or the feed subscription). The media is downloaded anytime someone clicks play/download for that specific media file.
With podcasting, advertisers are more interested in who listened to the actual episode, not how may folks over the past X years have subscribed to your podcast. You can think of feed subscriptions as the equivalent of TV viewers who are subscribed to cable TV service. You can think of media downloads as your "audience", this is what advertisers pay on and what TV networks determine if a show should be canceled or not.
Please let me know that you understand the difference.