Agents sometimes go so long before they say Yes to requested materials that they approach almost timidly.
I queried one of the top 5 nonfic agents and he got back to me in one day with "Please send the proposal." I sent it. A couple of other agents also read my proposal and offered me rep, and I was considering them. Then Mr. Top-Five entered my Inbox after about 7 weeks. "If this project is still available, I'm interested in repping it." He even KNEW it might have slipped through his fingers -- but there you go.
btw, I did wind up going with him, and he couldn't sell the book. Another brush-with-success story for another day.