Why Harry is the only one that can defeat Voldemort

[vmonte]

No: HPFGUIDX 121449


I've been wondering why the prophecy claims that only one person can 
take down Voldemort. 

The prophecy is extremely ambiguous. And was made before Neville and 
Harry were born. Is it possible that either child could have caused 
Voldemort's 1st downfall?  Is it possible that Lily and Neville's mom 
were both friends and each put the same protection spell on their 
child? But since Voldemort chose Harry, the prophecy is now certainly 
about HP.  

I also wonder if Harry's connection with Voldemort is so strong that 
if someone were able to kill Voldemort, Harry would also die. If DD 
is grooming Harry for the final confrontation, perhaps Harry is the 
only person who can sever his connection with Voldemort. And only 
then can someone else take Voldemort down.

What if Neville's protection is still intact?

Vivian