1. Shizune's Inadequate Skills: During the Three Ninja Defense Battle, she struggled against Kabuto and needed Naruto and Jiraiya's help for Tsunade's survival.

2. Powerless Allies: Yamato and Sai, elite members of Anbu Root, had weak combat skills, reflecting average chuunin level. 

3. The Incapable Aid: With only the Hyuga clan's Byakugan, he lacked the needed physical prowess. He almost lost his Byakugan in the Five Kage Summit due to Samui's ambush. 

4. Powerlessness in Illusion: she was effortlessly defeated by Sasuke's genjutsu during the Five Kage Summit. Despite her specialization, she couldn't demonstrate significant combat skills. 

5. Unseen Sand Guardians: Rasa, the Fourth Kazekage, was assassinated by Orochimaru during the Chunin Exams.