Vasojevici are most likely not native in Montenegro. It seems their tradition about Herzegovina is true because Herzegovina Vlach Bobani tribe, mentioned in 14th century turned out to be related to them (though no SNP confirmation yet). In addition in Croatia and even Slovenia in studies occurs a haplotype which is little more distant to Vasojevici (7/67 including some slow STR's) and has unique value of dys458=13. This haplotype does not occur anywhere East of Drina river/Montenegro so that does point for them being native in modern day Croatia. There is one Greek PH1246 which maybe has a more distant relation to them, hard to say often on 37 STR's if they are of the same clade for PH1246. If he is not (and that is probably likely) they are certainly some Western Illyrian tribe. That's why their cluster is not found in Albanians, similarly how J-PH1602 is not found in Albanians either.
This specific part about oral tradition of Montenegrin and North Albanian 15 century clans having origin in Bosnia and Hercegovina has been debunked thru genetic researches.
As majority of 15 century Malisor tribes belongs to haplogroups E-v13, J2b2, and R1b. While Bosnia and specifically Hercegovina part is dominated with haplogroup I2a1-CTS10228 up to 70 %.
E-v13 in Bosnia is mostly represented in Serbs, in Republika Srpska, in Croatia also at Serbs at Knin and more south to Dalmatian coasts, even tho there is of course Croatian and Bosnian clades also.
One fair part of these seems to be Montenegrin emigrants strait into "Krajina region" -
https://en.wikipedia.org/wiki/Military_Frontier#Background
I am aware of Croats and Slovens found within E-v13>PH1204* branch. It is not relevant as their distant (lets say 500 - 1000 years back) origin is not known.
They are brother clades to Montenegrin PH1204* and they are scattered so no real indication of history is known.
Regarding one Vlach found in Bosnia who is PH1204, that changes nothing about their origin being native Montenegrins. Brotherhood with centuries of history outweighs one Vlach sample.
What is known for sure is that Vasojevici have history of being Montenegrin tribe, and they just as many other Malisor tribes had oral stories of same forfather and origin of Hercegovina.
Both stories of same for forfather and origin from Hercegovina have been debunked. But possibility is higher that they are native Montenegrins as there is high percentage of E-v13, just as we find it at even higher percentages more south towards Albanians and not northwest towards Bosnia.
Reason why Albanians still dont have clear confirmation of E-v13>PH1204* or clades like you mentioned J2b>L283>PH1602 is because as it seems general population, and especially Albanians went thru vast bottleneck effect.
And then rapidly after fifth century in Common Era started to expand. I am guessing that there have been lost great deal of direct paternal lines in sense of subclades only in last 2000 years, while these that survived, perhaps had luck to expand.
Also E-v13>PH1246 was obviously lost among Albanians and Paleo-Balkan remaining populations since it was slavicized recently in Montenegro. So there is no wonder why it does not exist among Albanians today.
It was slavicized together with majority of that Montenegrin 20% E-v13.
I welcome discussion but i dont want to turn thread into E-v13 debate as clearly thread is dedicated to J2 Italians. If you wish you can open a thread of quote me or make question about E-v13 in any thread that has anything to do with Vasojevici or E-v13 and i will gladly answer.
So i will respect thread purpose and continue to comment if there is need and discussion about J2 haplogroup at Italians.