They'll expect you to trust them and just assume they have a high skill level. Money is your business's blood, and in entrepreneurship, cash flow is everything. If you like details rather than strategy, either shift your thinking or hire a CEO to do the job for you.
Here's a quick test to find out if your CTO can link technology and strategy: Ask your CTO how a company's chosen programming language choice affects strategy.
You hired this person assuming their judgment was better than yours.
Investors will want to know: What positions do you need to fill? Interview for chemistry. When you plan on filling them?