While I agree with this statement, in the case of Rush informations are really hard to check (I doubt there were person that checked it with for example four or five S Rush 20 slvl weapons equiped) and is actually quite inconsistent when you look at comments (there was person that reported results, that would suggest that Dark Rush 20 slvl gives about 4-5% DA increase). So unless somebody done extensive checks I would take DATA infos from JP wiki with grain of salt, especially with this whole "double attack is rolled first" (which is probably not true, or at least not in a way that people think it is).
To be honest, the biggest reason that it's hard for me to believe in 1% S Rush is that S Barrage has exactly the same value. Another is that accessories boost are much higher for DATA than other stats, when comparing them with weapons (this one is pretty bad argument though).
As for difference between versions: could some DMM player tell me if Solomon's first skill actually has cap of 500k in DMM ? (It clearly has 600k cap in Nutaku's version)