You won't know for sure until it happens. I have the best rooster I could have asked for. Sweet, cautious, and has never attacked anyone in any way. I agree with the toddler comment, you just can't take chances leaving him within flogging distance. However, he may never become aggressive towards humans. It isn't a sudden snap in his personality, it'll be gradual. Look for signs of boldness, like running up to you without caution or rising hackles. Until you know he's not going to become aggressive I'd keep the kiddy away.
I like to give my roosters the benefit of the doubt unless they show any signs of dominance towards me, then they're outta here!
I like to give my roosters the benefit of the doubt unless they show any signs of dominance towards me, then they're outta here!