I think if a person felt that way, then it would be suspicious if they didn't pick the child up from school. That's why LE look at patterns of behavior, and search for divergences from routine. But thousands of SAHM across America let their children take the bus home from school, and there is no malicious design in it. Kind of like how some SAHMs believe it's their job to cook every meal from scratch (no prepared foods), so for them it would have to be out of neglect or some emergency that they would feed the family Tuna Helper or pizza. But if another family doesn't care about that kind of thing and eats Tuna Helper frequently, the act of feeding the kids Tuna Helper on the day something bad happened would have no significance at all.
In the case of Kyron, it sounds like it was perfectly normal for him to take the bus to/from school.
ETA: I should also add, it can be very confusing to pick the child up from school some days but not others. My parents would try that with me some days when I was young, and it didn't always work out well. Sometimes I would miss the school bus because I'd think they were picking me up that day, or I would board the bus because I didn't get the message that they were coming to get me. Once I even got the message that they were coming to get me from a teacher who was mistaken, so I stood outside the school waiting for them, and when they didn't show, decided to walk home (I was 9 years old). They were, of course, waiting for me at the bus stop, and when I wasn't on it, they flipped out, and were driving all around town looking for me. After that they stopped messing about with that sort of thing and told me I should get on the bus every day. Consistency tends to work best with little kids.