It is easiest to say so.
However I speak based on facts.
In the Balkans were found skeletons dating about over 4000 years BC, and they have negroid characteristics, if you want I can put as theme.
I'm intrerested - could you please give us the pictures and also the study (or abstract) about these skeletons, if possible?
concerning Y-E1b-V13, I thought (without proof) they were there already in Balkans about 5500/5000 BC and that their spreading in north and north-east Europe was tightly linked to the dispersal and colonization of neolithic agricultors (Y-G2 and some of the Y-J2) along the Donau river and farther later (future LBK and descendant cultures) -
first farmers had supposedly a light taste of 'negroid' features that disappeard quickly between Near-Eastern and Europe - if the bearers of E-V13 had had strong negroid features at their arrival in S-Europe we should be obliged to imagine they were firstly seldom enough and overwent by the autosomals of other people in their crossings in Balkans, being the success of their male Y-HG due to a serious drift (to prove!) - something as 20-25% of Y-E1-V13 if autosomally african could not disappear like that, or it was already "washed" by a caucasoid N-E African (egyptian) crossing ...
thanks beforehand