I mean, not necessarily. Luffy's CoO was catching up to Katakuri's future sight, allowing him to dodge his attacks, yet neither Luffy nor Katakuri noticed Flampe's silent needle as she was an outside factor that had nothing to do with the battle. Similarly, Ben might focus his entire attention on a certain event, while Shiryu will quickly sneak in from behind and stab him. Or trying to do so against Shanks who is focused on Blackbeard and have Ben protect him like Garp did with Coby.