I think you didn't understand this (no offense), maybe I was not clear.
Regueiro et al. claim that I2a2 in Serbs is 9000 years ago.
Authors write (Quote):
"The high haplotype diversity of I2a2-P37.2/M423 lineages in Serbia (0.9977±0.0094) also supports the
hypothesis that the P37.2 mutation has been present in the Balkans before the LGM (Rootsi et al., 2004; Semino et al., 2000). Moreover, the age of I2a2-M423 chromosomes in Serbs based on accumulated Y-STR variation, is ~9000 years ago (Table 1)"
Sparkley and I debated about this and reduced the number 9000 for 300%. Those result is 3000. This is not much scientific, but you agree that it may have logic.
But here I don't want to make a point if the I2a2 chromosomes in Serbs are 9000 or 3000 years old, or between or whatever. I just wanted to say how is derived number 3000.
And for paper of Regueiro et al. This paper is important (but I don't think it is bible). The paper is published in renowned journal: Gene (in 2012). In the paper participated three American and three Serbian scientists. Since this is scientific research paper it would be good that someone refutes authors arguments with another scientific paper. Opinions from the heads have a lower weight.
About Thracian haplogroups, you can see that I refer to the paper of Bird (2007) who claim that main Thracian haplogroup is E1b1b (E-V13). And probably the part of E1b1b (E-V13) in Serbs came from Thracian tribes. But I also appreciate all those who claim that Thracian haplogroups are I2a2 and R1a. There are two groups of opinions. Maybe, as Tracians were big group tribes, different tribes belonged to different haplogroups, or tribes (or some of the tribes) were mix. We trying to answer this questions bearing in the mind that it will be performed researches haplogroups of Thracians, Dacians, Illyrians etc. and we will know more about this important issues.