I wouldn't bother too much, samples are from Neolithic, if they dig deeper the adjacent regions to more north/west very likely J2b2-L283 will show up.
Cetina are Late EBA samples, the start of EBA to Cetina Late EBA samples, there is a 1000 year gap (timelines of EBA start might be disputed region by region though, in Aegean it is usually estimated to start in 3200 B.C while in inner Europe 2500-2300 B.C, Chalcolithic to EBA transition might differ region per region). If you are talking about Late Neolithic to Chalcolithic transition and from Chalcolithic to EBA transition, it still works out. It's a chronology.