I think you're right, but in my opinion they don't overlap very well either. A startup is very unlikely to succeed without complete devotion and it's very hard to take the most rigorous classes while working >20 hours a week.
Luckily, for the next 8 months I get to focus 100% on my startup; I won't have to choose between a mediocre grade and a mediocre product. I'll have the energy and resources to create a great product.