If you're in a sitcom and only dig that deep, perhaps. In real life its easy to read body language and see if a junior is struggling. By the end of sprint one

If you're in a sitcom and only dig that deep, perhaps. In real life its easy to read body language and see if a junior is struggling. By the end of sprint one, you look at actual output and if it doesn't match your interpretation you adjust and get to know them better.