In short:
One of strong points are findings and proofs of Ukrainian scientists:
Zarubintsy culture is Bastarnaian dominantly.
In this way thesis of Soviet scientists that Zarubintsy culture was Slavic is rejected.
But Zarubintsy culture is predecessor of Kiev culture which was Slavic. It means Bastarnae had one of main roles in complex Slavic ethnogenesis, they became part of Slavic population.
We know movement Bastarnae people from Vistula area and surrounding to Dacian and Sarmatian borders, Bastarnae mixed with Sarmatians and Dacians.
We know that Bastarnae entered in the Romania and Balkans more times in big numbers, and mixed with local Dacian/Thracian population.
From histrorical sources we know that Bastrnae were very numerous that some authors highlight they are not tribe but people (modern term nation!).
Origin of Bastarnae is mysterious.
For most scientists they were Germans, some scientists think they were Celts, and there are more opinions.
What we know yet, they probably were nomads.
Considering the time and areas of their appearance, their movements, timely and territorial, Bastarnae are right candidate that they were dominantly I-CTS10228 carriers.
I-CTS10228 carriers were Old European Mesolitic survivors, according new findings I-CTS10228 is formed 5300 ago, and TMRCA is 3800 years.
I-CTS10228* is man from Alsace (Bas-Rhin), France.
We know that I-M423, ancestor of I-CTS10228, is found is Loschbour, Louxembourg, 8000 years old man from Mesolithic.
We can assume where in Europe Mesolitic survivors could lived and moved, probably Western/Central Europe, and beyond.
Central Europe today according the World Factbook is made up of the following countries: Germany, Switzerland, Austria, Slovenia, Czech Republic, Slovakia, Hungary and Poland.
They could have contact with proto-Celts and Celts, and Illyrians etc.
Germanic tribes had arrived from North.
When Bastarnae formed dominantly from Mesolithic survivor population I-CTS10228 carriers, they could have some Celtic elements, even Illyrian.
But probably with flow of time more German (I1), therefore it can be possible that Bastarnae mostly were mix I-CTS10228 (dominantly) and any I1 in any ratio.
What is interesting there are opinions among scientists that their name is from the word bastard.
Maybe they could look to other populations as unknown.
They probably adopted German language.
I-CTS10228 carriers could be in other tribes too (as Sciiri for example) but probably in much less numbers.
In areas where and time when they lived Mesolithic survivors didn't have contact with R1a clades who are dominant in Slavic population. How Bastarnae moved to the East they could have contact.
In 200 BC Bastarnae inhabited the region between Carpatian mountains, and to the north till river Dnieper and to the south borders of Dacia.
Balkans: I-CTS10228 since 179 BC till Slavic arriving 6th century
* Bastarnae first enterd in Balkans, area in todays Macedonia 179 BC.
* Bastarnae settled Balkans brought from the Balkan rulers (not as invaders!), some sources speak about process of "ethnic engineering" where imperial rulers did massive deportation/settling of ethnic groups as part of military/political plan.
* Bastarnae mixed with Thracians/Dacians (today's Romania, Moldavia, and Balkan countries Serbia, Bulgaria, Macedonia etc.)
* One Western source claims that substantial part of Balkan population till 5 century AD was mixed Tracian/Bastarnae!
* Plus, we can have in mind with the growth power of Goths Bastarnae became their allies, and they participated in Gothic invasions in the Balkans. It means, in Gothic invasions, I-CTS10228 arrived in the Balkans too.
Ancient Y-DNA samples in Central Europe and samples in the Romania/Balkans 200 BC-570 AD will confirm or disprove these assumptions.
An habit can be complicating because Bastarnae practiced burning process till 900 degrees Celsius.
But we can suppose scientists can find appropriate samples.
Story about Bastarnae is fascinating it is story about struggle for survival, in one period of history I-CTS10228 carriers barely survived but after that they spread in many directions.
First Homo sapiens in Europe during 45,000 to 28,000 years ago, belonged CT, C1a, C1b, F and I. I survived, developed in I1 and I2 and I-CTS10228 carriers are today more numerous I2 carriers in Europe.