There are so many ninjas now that remove protection from debuffs that this SA is laughable now. Not to mention that many more ninja with 2+ chases. You used to have to do this with clones because it was the only way to get enough hits without chiyo 10 puppets. Also, one thing that many people don't notice is that this particular SA is harder with more people. If you have 2 people teamed up, then the ninja that only take 1 points damage will have more than double the life of going solo. And a team of 3 has more than triple the HP. So, you actually make it harder on yourself to go in a group.