I`m curious, do you think Zazu was given the task of watching/babysitting Simba very often, or only once in a while?
We all know how Sarabi says that Simba and Nala can go to the Elephant Graveyard (err, I mean the Waterhole!) as long as Zazu goes with them, to which Simba replies: "No, not Zazu!"
I`m not sure if this implies that Zazu has tried to spoil his plans before, or if Simba is simply worried that the bird`s precense will make crossing the border more difficult, not to mention hightening the possiblity of getting caught...
Zazu (unlike Timon and Pumbaa) is actually in the king`s service, he has a job and duties to perform, and I`m sure Mufasa and Sarabi wouldn`t ask him to keep an eye on their cub every single day...
What do you think?