If it is not Voldemort, then who? - Is Dumbledore worried about someone else?

[David]

No: HPFGUIDX 153364

Hi all,

     I was just rereading part of GOF when I came across something 
that I think might be noteworthy.  On page 601 of the US edition, 
Harry is telling Dumbledore about the dream he had with Voldemort in 
it.  After Harry finishes telling him about the dream, they talk 
about how Voldemort could have held a wand (if he was supposed to be 
so weak). Harry says:

"...how could he have held the wand?"

Dumbledore says:

"How indeed?" 

Then Dumbledore uses the Pensieve, then it reads:

"Professor," Harry said at last, "do you think he's getting 
stronger?"

Now, to me, here is the curious part.  After Harry asks the above 
question, Dumledore begins his reply by saying, 

"Voldemort?"  

Voldemort with a question mark?!

He then continues to say, "Once again, Harry, I can only give you my 
suspicions."  

Well, speaking of suspicious, I find it suspicious that Dumbledore 
had to clarify who Harry was talking about.  Who else did he think 
Harry might be talking about?  Is there someone else out there that 
Dumbledore is worried about becoming stronger?

I realize the Dumbledore was just using the Pensieve, but I still 
think it is strange that he had to clarify who Harry was speaking 
about.

Have a nice day,
David, who loves treacle tart!