Remarkable coincidence in March of 1998

On March 25, 1998, Eric, Dylan and their fathers appeared before Magistrate John A. DeVita who put them into the diversion program.

On the same day, maybe even at the exact same time, Andrew Golden and Mitchell Johnson had their probable cause hearing. (I am new to the forum and cannot post any external links yet but you can google this info.)

It was just a coincidence, of course, but I still find it remarkable because the only two school shooter duos in US history appeared in court on the same day, albeit for different reasons.

Even though Eric and Dylan claimed that they had the idea of NBK much earlier, I still wonder if the Jonesboro massacre had a greater impact on them after all. What do you think?

I think it had an impact. Even their plan to shoot students running out of school is pretty similar to Jonesboro shooting.
And yes, what a creepy coincidence.

That they were planning to shoot people running into the parking lot seems to me an artifact of assuming the bombs failed at 11:17, which comes from Dylan's (contradictory) notes, not from physical evidence like the bombs themselves. Running out of the library seems a lot more plausible to me, given that starting from the cars is a myth, but starting next to the library emergency exit is not. They also kept telling everybody to get up and flee to shoot them - as if they had expected them to before, and the emergency exit was their only place to go.

I feel most likely it had an impact for a few reasons. Late April 1998 is our first references to the massacre from Eric with both of them. February is when Dylan first mentions it. You've got Jonesboro in between.

Also, they were familiar with the game Redneck Rampage, a humorous Duke Nukem 3D clone, which follows a two-man team of shooters in Arkansas.

Though, of course, they had bombs, which I suspect is why things like e. g. police response were so different.