Geese waddle, chickens have wattles
Yeah, that's why I never want to say with certainty. It is so hard to tell from pictures because monitors display colors differently and lighting can be so different as well. However the difference in color that is showing in that third pic is what I was trying to verbally describe as the difference in color between a pullet and a cockerel. If, in reality, any of the birds had that darker, shinier look that is showing in that photo, I would guess cockerel. If in person they all appear to be the same color, they likely are all pullets.
They look like they are coloring out nicely. Did you get them from a breeder or a hatchery? They look like nicer Rhode Island Reds than I usually see from a hatchery so if they are hatchery birds, I'm glad to see the hatcheries are picking up their game.

Yeah, that's why I never want to say with certainty. It is so hard to tell from pictures because monitors display colors differently and lighting can be so different as well. However the difference in color that is showing in that third pic is what I was trying to verbally describe as the difference in color between a pullet and a cockerel. If, in reality, any of the birds had that darker, shinier look that is showing in that photo, I would guess cockerel. If in person they all appear to be the same color, they likely are all pullets.
They look like they are coloring out nicely. Did you get them from a breeder or a hatchery? They look like nicer Rhode Island Reds than I usually see from a hatchery so if they are hatchery birds, I'm glad to see the hatcheries are picking up their game.