Since all flood forms share memories, knowledge and thoughts.(wiki+gravemind quotes)
And since the first gravemind was more or less a Precursor(wiki+books).
Then the gravemind speaking to us in halo 2 and 3 is technically a precursor.
You would say it is only 0000000.1% precursor since the rest of the memories are other species but remember that the precursors created the flood and the first gravemind.
So it's safe to say that their indentity prevails over the rest.
The flood are , after all the Precursor's creation.
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[quote][b]Posted by:[/b] OdorousLicense3 Greg Bear is an idiot. Gravemind =/= Precursor[/quote] lol what? 343i told him to write that you idiot. Its Canon. The precursor said, the Flood and the Precursors are one in the same.