"That's insane!" Kaden said as Dave talked about how he died. The only way someone would be able to spot someone who had a class like Dave would be someone who had either a high rank or a class trained to spot certain things.
"What rank were you before you died?" Kaden questioned.
"I was rank B+ and almost at A-." Dave said proudly.
This was quite an impressive accomplishment. Just because someone had a class that could be SS or SSS+ like Kaden's didn't mean that they would get that high. All sorts of training and other circumstances depending on the class determine whether or not you reach the predicted rank or a higher rank.
In Dave's case since his projected rank was at S- getting to B+ was harder for him than it would be for Kaden in most cases. This only furthered how impressive his rank was but the thing now is, how could someone like him get destroyed by the person with the Kitsune mask?