Japanese Bantam sexing

[Rezpup]

This is only my 2nd year raising these beautiful bantams and I'm having trouble figuring out if this one is a male or female.
Hatched out Feb 19. I had 2 others that developed a really rosy red comb by mid March and definitely had the roo attitude but this one has just really developed the comb in the past couple of weeks. It chest bumps with the other chicks but overall is pretty calm.
Any help would be appreciated

 

[Cyprus]

Cockerel for sure. Notice the male specific hackel feathers.

 

[Gray Farms]

Those are both cockerels.

 

[Rezpup]

Thank you!
I knew the OEG was a cockerel and so far they're doing okay together but I do have another coop with only pullets I can move him into if/when they start squaring off