Still not fully convinced

[The Moonshiner]

The dark neck, wing and saddles, the fact that those feathers are narrow and pointy, the big comb and waddles all stand in their tip toes and scream male . The tail is the only thing that actually doesn't, but that's 100% male.

Ya I didn't even get to the tail with everything else going on.
That dark blue extending past the neck to the back and saddle area is a dead giveaway as a male when it's a blue variety.

 

[WingItRanch]

To help clarify why we all know this is a cockerel:

Thick legs
Pointy, shiny hackle feathers
Pointy, shiny saddle feathers
Even the sickle feathers are appearing

Some cockerels take a while to show behavioral signs. For example, my cockerel didn't start mating attempts until 6 months. He didn't start crowing until 6.5 months. Some boys will attempt to crow at a few weeks. Just like humans, each chicken is an individual and mature at different rates.

 

[Klutch]

Roo for sure, looks like a ee gone wrong.