Hen or Roo?

[Mismetic]

Hello, first time chicken owner here! I've tried my very best to sex this chick but I just am not familiar enough with sickle and saddle feathers to see the difference. What do the experts think? Hen or Roo?

3 months old, comb and waddles are bright red and significantly larger than the rest of my pullets, VERY vocal but no crowing. picked them all up from the pullets bin but this one is either maturing insanely faster than the others, or I think is a roo.

Added photos and a video here: Video!

 

[DobieLover]

He's a cockerel. Won't be a rooster until he's 1 year old.

 

[ShrekDawg]

Cockerel

 

[Rhodebar Lover]

I’m seeing quick to mature pullet

 

[PennyWars]

Gosh, that is a tough call. The tail tuck in the photo of it pecking has me suspect that's a boy, but the feathers aren't really giving much clue.
When you can't tell by looks, behavior is the next best. Go out with treats, mealworms or even a few regular worms from under a rock somewhere. Walk a short distance away from the flock, call them, toss some treats off to the side away from you and keep some in your hand to feed whomever approaches. If that one finds the ones you tossed aside and starts picking it up and dropping it while making a chk-chk-chk sound, (called tidbitting) and then gives it to one of the hens, it's most likely a young male.

 

[Jener8or]

Pullet. The coloration is very even and I don't see any pointy feathers coming in.