Why would locket in 12,GP be real horcrux?

[Tonks]

No: HPFGUIDX 153082

--- In HPforGrownups at yahoogroups.com, "pforparvati" <tareprachi at ...>
wrote:
>
  But still why are we supporting this theory, when Harry himself is 
not able to relate those two lockets.
>

Tonks:
Harry doesn't relate the two lockets for the same reason he doesn't
know that Aberforth is the bartender at the Hogshead and the fact that 
he didn't realize that if he couldn't see Draco on the map and Draco 
wasn't in Hogsmead that Draco must `obviously' be in the ROR.  Because 
sometimes Harry doesn't think and he has not learned to be very 
observent. He also isn't able to use his full abilities when he is 
under emotional stress. If he wants to be an Auror he has a bit more 
learning to do.

Tonks_op