Incomplete resurrections don't seem to matter as far as the century thing is concerned. Dracula only seems to be at his strongest during the century resurrections, and it's only then that he can be revived through his own remains without it being botched(CV2 and HoD). Other times, it seems like he needs outside help, especially through vessels, to resurrect(for Bloodlines and PoR, it seems that the World Wars were helping in some way).
Here's how the century resurrection thing is happening:
-1476(first death)-1576(full resurrection)
[1479's events don't seem to effect the full resurrection.]
-1576-1591(Dracula wasn't killed in CV Adventures, just wounded. He escaped in the form of mist, and returned to kidnap Christopher's son many years later. It wasn't until Belmont's Revenge that he was killed by Christopher.)
-1591-1691(full resurrection)
-1691-1792(Full resurrecton)
[1698 and 1748's events don't seem to effect full resurrection. In both cases, Dracula tries to possess his own remains and ends up becoming a sorta wraith-like being.]
Now we are up to the part with SotN. I don't think it's meant to count as a full resurrection, and call it a hunch, but I don't think Dracula will full resurrect in 1797. If anything, it depends if IGA will go by the book, where Dracula was already around during that time. Hence it's possible he could've been resurrected years before, 100 years after RoB, 1892. The significance of 1897 is still that Dracula is defeated(at full power) and will rise 100 years later in full power(1997). That leads me to believe that it will take him three years to call forth all the armies of darkness, and when that's complete, the Demon Castle War will happen in 1999, the Belmonts will show up and the final battle will happen. It's just a theory.