[Shirakumo knows perfectly well that Aizawa is a better fighter after an extra fifteen years of training and real life experience, while Shirakumo has spent the time essentially being dead, so he's banking on the element of surprise and not attempting anything fancy, just trying to get Aizawa down and into a solid arm-lock before he can turn the tables. He knows the longer this goes on, the worse off he's going to be.]