Dumbledore and knowing of Horcruxes

[Inge]

No: HPFGUIDX 138920

--- In HPforGrownups at yahoogroups.com, "Hagrid" <aussie_lol at y...> wrote:
SNIP SNIP
> If not for Slughorn's information, DD and Harry would have no clear 
> idea what the task was in front of them to bring down LV. The "7 
> Horcruxes" memory let them know at what point should they hang up 
> their "Indiana Jones" artifacts hunt and start getting the possie to 
> hunt down the then vulernarable Voldemort.
SNIP

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Inge:
I may be very wrong here but had Dumbledore not injured his hand by the 
ring when he showed up at Privet Drive?
Did he not show Harry the memory of the cup & locket long before Harry 
got Slughorn to reveal the Horcrux-conversation that he (Slughorn) once 
had with Riddle?

If so - it seems to me that Dumbledore already knew for a long, long 
time that the Horcrux-theory was to go for. 
So even if Harry had NOT succeeded in making Slughorn tell the truth - 
Dumbledore already had a good clue what to do to bring down LV. 
Slughorn's information wasn't really THAT important...... or?