The Last Horcrux Still Unmade

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No: HPFGUIDX 146478

There are certain inconsistencies, it seems to me, in Dumbledore's 
theory about seven horcruxes. The greatest is his idea that Voldemort 
already has seven horcruxes. He may still be one horcrux short and 
still be looking for the Gryffindor object to turn it into  a horcrux. 
There is no evidence that he has turned Nagini into a horcrux and that 
too, after the murder of a foul muggle, if the whole theory of making 
horcruxes is to make them after a particularly important murder. 
Further, if Voldemort's quest for seven-part soul and seven horcruxes 
is anyway significant, then there seems to be no grand effect of 
making seven horcruxes. If Voldemorte had turned  Nagingi into a 
horcrux after Frank's murder, there should have been some signifact 
fallout to his state. But there is none. He is still in that child-
like state till Harry is kidnapped later in the novel. So what gives? 
   The reasons adduced by Dumbledore on why he thinks Nagini is a 
horcrux are no reasona at all because Nagini is devoted and faithful 
and seems to share an unusual relationship with him even before the 
Frank Bryce murder. ANd in Gobelt of Fire we see that Voldemort does 
not want to settle down for a cheap alternative and prefers to wait 
for harry's blood eventhough it is hard to get. So why would he settle 
down for Nagini when his original quest  is to get the objects of the 
four original founders.
   This leads to another aspect of Half-Blodd Prince that I was 
intrigued about. The author said that she was chipping in large clues 
in the book on which the next book can be constructed;  is 
Dumbledore's theory supposed to be one of those clues? Is the 
intellectual map for Harry  all set out and all he has to do is find 
out the remaining horcruxes or is there going to be some bafflement 
for Harry and ourselves along the way?

Regards,
Adi