My EE made a funny squacking noise at 5 1/2 wks.  That's when I noticed he was the only one with a pea comb.  
Then nothing until I moved them out to the coop and he started in again with the funny squacking at 7 1/2 wks.  
Saturday I slept in until 6:30 am and he was out there doing his not yet perfected crow as if to say 'come let us out of here, the sun's up'.
I made it out there earlier this morning and no crowing.  I'm loving the crowing.  I was so happy I ended up with one roo in the of ten pullets.  AND he's nice.  I was sitting out in the run with them as the sun was setting and he flew up on my back to shoulder to lap.