The traditional thinking is that old Vedic Sanskrit gave way to Classic Sanskrit, which became Hinduism's official language, whereas common people spoke more 'naturally ', not 'refined' like Sanskrit was and the priests were reciting chants. Prakrits eventually led to all (?) Indo Aryan languages.
Sanskrit literally means cultured/refined. Prakrit means natural/wild.
khanabadoshi (11-23-2017), tipirneni (11-22-2017), Xehanort (11-22-2017), Zayd (11-22-2017)
Scythian geneflow can show up as anything depending on what references a calculator based on moderns uses. If you mean what is their differrentiating characteristic when compared with EMBA or LMBA steppe groups such as Yamna, Srubna, Sintashta, and Andronovo, then it would be their elevated Iranian and Siberian based admixture. indicating significant admixture with peoples from Siberia and the Iran region (at least for W Scythians that I have analyzed).
However, keep in mind that Scythian substructure varied considerably between W and E Scythians, with the latter having a heavy dose of E Eurasian admixture, and that we only have a couple of half-way decent W Scythians, one of which I have diploid genotyped myself (Volga river Scythian on my website) and analyzed at length. Scythian I0247 (Volga river) recovered close to the border of Kazakhstan and Russia shared the most alleles and drift with some Iraqi Kurds from W Asians http://www.eurasiandna.com/2017/10/0...e-ancient-dna/ using IBS, and dstats. This was also supported by f3s and haplotype sharing. Iraqi Kurds were on the same level as Tajiks, and close to Tatars (highest shared drift for this W Scythian sample).
It would be interesting to analyze samples from the Afghanistan area if and when they are recovered. Presumably they will share high drift with Tajiks, Pashtuns, and some Punjabis.
As far as picking up their Siberian signature on calculators based on moderns, that would get lost between the various Siberian admixed moderns such as Caucasians, C and SC Asians that are used to generate the calculator. For example, take those Iraqi Kurds who share one of the highest drifts with Scythian I0247. Let’s say that 247 had 15% Siberian admixture and ancestors for those Iraqi Kurds were 20% Scythian admixed. Then we are talking 15% x 0.2 = 3% Siberian admixture for those Kurd ancestors. All or part of this 3% can easily get accounted for by the Caucasian, C and SC Asian score of those Kurds in those calculators. You get the idea....