Board Thread:Questions and Answers/@comment-31775302-20170419061606/@comment-996391-20170419101320

"The 21st century is a digital book. Zola taught HYDRA how to read it. Your bank records, medical histories, voting patterns, emails, phone calls, your damn SAT scores! Zola's algorithm evaluates people's past to predict their future."

It doesn't matter if Steve Rogers knew about Strange or not. The point is that HYDRA knew about Strange, and that's why Sitwell mentioned him.