He's definitely a slow maturing cockerel. I've had some take forever to get Saddles, & I've also had super fast maturing cockerels, that get Saddles in as early as 5½ - 6 - 8 weeks of age.He looks healthy to me. Let me tag someone I know has experience with cockerels and roosters.
@MysteryChicken
@Shadrach
Then I've had the average that saddle around 4-6 months.