Why DNG files are bigger when converting from TIFF?

When I shoot in RAW, my normal workflow is to convert all images to DNG and start editing in Lightroom. But as you know, there are some photos that need extra editing in pixel based software such as Photoshop.
When I right-click a DNG in Lightroom and chose "Edit In... » Edit in Adobe Photoshop", the photo will be opened in Photoshop as an 8-bit TIFF file for editing. For demonstration of my issue, let's assume I don't do any changes and just save the file as it is. A new TIFF file will be created next to the source DNG with "-Edit" in it's name.
Back into Lightroom, both files are almost the same, one is DNG, the other in 8-bit TIFF. From this point (assuming I did change something in Photoshop, otherwise what would be the point in opening it there) I should do my further editing in Lightroom in the TIFF and not the DNG one. Let's say I'm done with the work and export the final edited TIFF file back into a DNG (I like this format and I like to keep all metadata changes so I can easily revert back to the original). I've also exported the original DNG file for comparison.
And now I realize the following:
DNG to DNG » ~7Mb (basically the same as the original DNG)
TIFF to DNG » ~15Mb
Why such a big difference?
I didn't do any editing either in the original DNG or the Photoshop converted TIFF. Any techincal reason for this that I'm not aware or am I doing something wrong?

I did a little bit of research and:
1) The embedded previews are always JPEG files (medim or full size, doesn't matter). But now that I think about it, I don't think you were talking about the previews when you mentioned the TIFF being embedded.
2) I did a quick EXIF lookup on 3 files exported to DNG: a) Original DNG b) 16-bit TIFF converted to DNG c) 8-bit converted to DNG. Here's the EXIF results:
a)
SubfileType                     : Full-resolution Image
ImageWidth                      : 3736
ImageHeight                     : 2772
BitsPerSample                   : 16
Compression                     : JPEG
PhotometricInterpretation       : Color Filter Array
SamplesPerPixel                 : 1
b)
SubfileType                     : Full-resolution Image
ImageWidth                      : 3648
ImageHeight                     : 2736
BitsPerSample                   : 16 16 16
Compression                     : JPEG
PhotometricInterpretation       : Linear Raw
SamplesPerPixel                 : 3
c)
SubfileType                     : Full-resolution Image
ImageWidth                      : 3648
ImageHeight                     : 2736
BitsPerSample                   : 8 8 8
Compression                     : JPEG
PhotometricInterpretation       : Linear Raw
SamplesPerPixel                 : 3
This probably means something like you said... The embedded files are different and some take more space than the others. The first one is 7.220Kb, the second one (16-bit TIFF) is 44.030Kb and the third one (8-bit TIFF) is 15.284Kb.
It makes sense I guess, but I still would love to hear a more technical explanation for it but it's obvious it has something to do on how the pixels are saved in the DNG file. The keyword is probably the PhotometricInterpretation.

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