Actually, using dd without any number, is xtool internal deduplication without srep, which might lead to bigger output sizes.
Example for "Starfield - Textures01.ba2": First is xtool internal deduplication (dd), second is with srep (dd#)
Code:
Streams: 15714 / 15714
Time: 00:00:52 (CPU 00:04:52)
Duplicates: 4795 (170 MB) [1.09 GB >> 1.37 GB]
Size: 4.00 GB >> 5.06 GB >> 3.69 GB
Additional decoding memory is 133 MB
Decoding speed improved by up to 1.38x
Done!!!
---
Streams: 15714 / 15714
Time: 00:00:57 (CPU 00:04:59)
Duplicates: 4795 (170 MB) [1.09 GB >> 1.37 GB]
Srep decompression memory: 259 MB
Size: 4.00 GB >> 5.06 GB >> 3.69 GB >> 3.12 GB
Additional decoding memory is 133 MB
Decoding speed improved by up to 1.38x
Done!!!