I was leaning towards roo also. I'm learning as I go, but in comparison to the lavender of the same age, hackle feathers are pointier, comb and waddle are brighter red and larger, and then there's the crowing. Lol
Tickle (lavender Orp) is my favorite too. We are still trying to figure out if Peep, the buff, is a roo or a hen. He/she has been crowing for a couple months now, but was sold as a pullet. Even though I was raised on a farm, we never had chickens.
Thanks for welcoming me. Right now I have 2 Orpingtons (lavender and buff) an Australorp, and a Sussex. I'm getting ready to add a couple more Orpingtons and some Icelandics.