Yes, that sounds good. The families may not be able to talk due to being intimidated, but if their child was dead already they'd probably have nothing to lose. What Tsunade and Kakashi are gambling on is that the kids are definitely still alive and somewhere within that area. They expected ninja, but not ninken to track, so there may be a hurry to relocate while Sound Ninja distract Sakura and Kakashi. If Sakura does manage to fight him off, he can either attempt to flee and lead her into a trap or she can get taken herself, or almost, until Kakashi shows up? The typical Sound Ninja are -- I assume -- to be low-chuunin to low-jonin level at best depending, so Sakura might find a challenge in one, all depends.