You're saying that's irrelevant to linkage? Sorry but that's BS. What if someone had 1/3rd of the network and attempted to de-anonymise funds? 1 round of Darksend and that's a 1 in 3 chance of tracing linkage, 2 rounds 1 in 9, at 8 rounds that's 1 in 6561 and Darksend is set for permanent integration so you're talking hundreds of rounds. Possible? Yes, probable? Hell no.