revive live rock?

I inherited some live rock from someone shutting their tank down. Rock had
good form/shapes, but was not in good shape i.e., blackened at a portion,
smelling, etc.

I'm not sure if I did the right thing, but I started out by cleaning out the
rock in freshwater, scrubbing, etc. The rock looks better, but I think I
prob killed all the critters that make the live rock "live".

Would it be worth continuing? the rock is currently curing (seperate tank,
skimmer, etc), and I was considering purchasing some seed live rock and
putting it in after a week but not sure if/when to do this.