That was only one example of many... I always add the whole album at once (and who wouldnt? ).
I too have data that appears to be missing from my playback statistics. I couldn't catch a case where I didn't know that I didn't edit the metadata, etc. then I found a CCR album with three tracks that didn't have metadata (no play count or lastplayed, etc) and all the others do. The key is that if you take the start time of the previous track, then add the length of the previous track and the length of the track with missing metadata you get the start time of the next track. Also the file system has the identical last modified date and times for all of the files.
In this example track 12 doesn't have any playback statistics but those around it do.
Predicted Track File System Last File System
Start time Length Start time Number Track Name Modified Time Size File System Path
17:56:06 2:12 17:56:06 10 Don't Look Now (It Ain't You or Me) 9/12/2013 20:17 15,086,034 F:\My Audio\dBpoweramp\Creedence Clearwater Revival\Chronicle\2 10 - Don't Look Now (It Ain't You or Me).flac
17:58:17 4:13 17:58:18 11 The Midnight Special 9/12/2013 20:17 26,949,369 F:\My Audio\dBpoweramp\Creedence Clearwater Revival\Chronicle\2 11 - The Midnight Special.flac
N/A 3:28 18:02:30 12 Before You Accuse Me 9/12/2013 20:17 22,341,262 F:\My Audio\dBpoweramp\Creedence Clearwater Revival\Chronicle\2 12 - Before You Accuse Me.flac
18:05:58 2:20 18:05:58 13 My Baby Left Me 9/12/2013 20:17 16,514,462 F:\My Audio\dBpoweramp\Creedence Clearwater Revival\Chronicle\2 13 - My Baby Left Me.flac
18:08:18 6:26 18:08:18 14 Pagan Baby 9/12/2013 20:17 44,799,384 F:\My Audio\dBpoweramp\Creedence Clearwater Revival\Chronicle\2 14 - Pagan Baby.flac