That's "sort of" been the question about Ocean Parkway for more than a decade now, hasn't it? The Gilgo 4 were similar enough to always be a group while the others have been questioned.
After Rex Heuermann was charged with Maureen Brainard Barnes's death, I looked at the differences between her and the other 3 GB4 and concluded it was part of RH fancying himself a "troubleshooter" and a "solver of problems" which might account for the change in MO from dismemberment to whole remains disposal as his needs to hide victims' identity (internet hookup instead of street), and acquisition of the Avalanche for better concealment during transport of remains, etc. plus perhaps he was injured in one of those accidents and physically could not do as much work as before.
Besides, with all the remains discovered along Ocean Parkway, RH who worked there in his youth and was very familiar with the desolation, could easily drive through and keep an eye on things, basking in his remembrances. However, maybe other killers were attracted to the area for the same reasons and not all the remains discovered "belong" to RH.
However, with these two new sets of limbs . . . . male and female -- different from before. So possibly new killer(s). Why near two schools. I get it's a "park" or government-owned and operated property as were the earlier LISK remains. Could this possibly be a new kill from a killer from 20 years+ ago who doesn't want RH to receive credit for his own body count? Or as mentioned above --- completely unrelated to earlier murders?