I will also grant that a load of unsplit long logs that are very crooked may have a lot more interstitial space in its total volume (wood + air) than a load of straight logs. If this is the case, then I can see how it's possible that the total volume after splitting could be smaller than the total volume before splitting.
Correct. However once cut into rounds and then split it will take up more space than the cut rounds. Still less than the uncut logs though.
Harry K