File size increase when converting EOS 5d Mark II 10 Mpixel Images to DNG?

Hi,
a colleague of mine is having issues when converting 10 Mpixel RAW images of his 5d Mark II to dng format. He shot the images at a smaller size in RAW format to save memory. When he converts the RAW to DNG using lightroom 2.2 the filesize increases to 39 Mb. That's almost the size of a 22 Mpixel RAW file and defeats the whole idea of shooting lower res.
My guess would be that the dng conversion doesnt take into account that the actual pixel count is lower than the full sensor res and somehow saves redundand data for the missing "sensor pixels". The dng is still 10 Mpixel large btw.
Can anyone else confirm this? Looks like a bug to me if that's the case.
Regards,
Mike

What settings is he using in the conversion? He should NOT check the linearization option and the option to include the original RAW. He should have lossless compression checked. Just use the defaults which does those things. A 12-bit 22 Mpixel dng file should be about 22 MB, not 39. I don't have any experience with sRAW though and I don't know how those are converted to dng.

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