I think this Basarabi haplotype is a (recent) migrant from further south. As you noticed, they all share DYS388=16, DYS389I, II=13, 29, and are close to each other which suggests a founder effect. This is precisely the same haplotype that a Greek through BigY recently tested Z631+ and negative for downstreams as I described on the top post. The J-Z631>Thaçi Korbi Cluster, with 385=14-16, is around 8/111 to this Greek, so they certainly seem to be related within around 1000 years. This Greek might have a closer Albanian match. For example, here is a Tosk haplotype from Boattini et al 2015: 12 24 16 10 13 17 12 13 11 29 16 16 19 11 13 9 23
The Greek has only one difference out of 17 markers, and that is DYS19=15 vs 16. The above haplotype is missing the key 388=16 to be certain of their relationship though. Anyways, this Z631 haplotype with 388=16 and 389I, II=13, 29 to me seems some shared "Albano-Vlach cluster". Worth mentioning is that we recently got a J-Z631 looking haplotype from Mat, Albania. He is around 13/67 from the above haplotype but doesn't have the above characteristic values. Though J-L283 haplotypes, and especially J-Z1296, are usually much farther apart than they appear, as you have noticed. But considering J-Z631 is very diverse in Albania (much more than I initially thought), and 388=16, 389I, II=13, 29 appearing in Albania, this haplotype most definitely has its roots in western Balkans I would say.