Counting with Isaac

For the last month or so, we've been working on numbers with Isaac.  When David and I try to teach him anything, we waver between the certainty that he's a genius and the fear that he's going to need us to count his pocket change when he's sixteen.  He does send mixed signals:

Signs that our son is the next Einstein:

• Isaac pointing to the three when we need to go to the third floor. (this is hard--to understand numbers as both visual and auditory).

•  He's starting counting out only odd numbers: "nine, eleven, thirteen, fifteen."  Who knows if it's intentional or not?

Signs that Isaac is, uh, non-mathematical: 

• Answers proudly "Eight!"  when I ask him how many balls there are.  Correct answer = two.
• Insists on counting, "one, two wheeeeeee!" instead of three.

Guess the verdict is still out...