Naruto: The Prince of Lust - Chapter 305

... village whenever they like. Rasa would’ve had to give prior notice when he’d arrive so Konoha can prepare for him. Jiraiya assumed in transit would be the best opportunity to ambush the Kage, because a brilliantly placed trap has the capacity to take down anyone not expecting it. It’s why Karin’s sensing ability was so crucial. She’d be able to sense them without being sensed herself and alert Jiraiya.

An adamant Rasa continued, "as much as you’d like me to accept those four were somehow ...