It isn't for them, Kushina-san.

[ Kakashi explains as he's more or less dragged out of the store by her and... ah, they don't appear to be walking in the direction of his building. By all intents, it seems she's very determined to drag him home with her, and Kakashi knows better than to object. ]

It's for us. We need to collect intel, understand their operations, how these missions actually work. Even if Shikamaru and other shinobi can provide us with good information, it's not the same as being on a mission yourself to really understand what it's like in the field.

[ All things considered, it wasn't all that different from a B-rank mission back home.

And Kakashi hardly considers his injuries serious at all. Serious is when he can't get up and walk himself off the field to patch himself up. The fact that he's still standing and perfectly capable of taking care of himself (if not for the fact that Kushina certainly isn't about to allow that) means that whatever injuries he came back with are trivial in comparison with the mission's purpose. ]