Interviewed two days ago with a BB, Initially after felt good...But now having second thoughts

I had a phone interview two days ago with a BB. Initially after I felt good about my performance, but now having some doubts on some of the things. Is it bad when an interviewer doesn't ask a lot of follow up questions to your responses, and you find yourself basically running the show (except for Q&A at the end where i asked him plenty).

He asked me a competency question, and so I gave a very detailed account, and got a little technical. His response to my answer was "sounds complicated" Is that bad?

Also, He asked me to tell me a company I like. So i started by giving a little overview of the industry n then went on to the company, first talking about the company's current valuation purely from a quantitative n technical aspect. Then I started giving qualitative reasons why i felt the company was going to do well in the future. But he interrupted me after I was halfway through my reasons to ask me a question. The question itself was lacking any insight. Thinking about it now, maybe I should have kept my responses less technical and complicated because i am worried the interviewer didn't get it.

Although the Q&A session went great as far as asking him questions, and really getting him to talk. He even complimented me on one of my questions.

Today is the second day, and I haven't heard anything back. I was told i will hear back within a week, so maybe I am over analyzing. I sent him a thank you email yesterday, but no reply. Bad sign??

So what do you guys think?? People who have experience, can you please provide some input on this??