Actually, I think the link has more significance than that. Peter Tomasi knew about Grant Morrison's plans for Batman from the beginning; he was the editor who approached Morrison and heard his pitch. Here we see that Tomasi apparently used his Nightwing run to lay some of the ground [!] for Blackest Night. What other foreshadowing might lurk in those issues of Nightwing?
For example, Tomasi showed Talia al-Ghul overseeing an experiment to breed a race of people who had accelerated growth, exceptional fighting abilities, and short lifespans. Shortly before, Morrison showed Talia arriving in Gotham with a boy who had accelerated growth and exceptional fighting abilities, a boy who's become a bigger part of his Batman saga. Hmmm.