Not every boxer has a puncher chance... Being able to knock out people with one punch is a god given gift. Anyone who says differently doesn't know sh**. Not everyone has punching power, and not everyone has speed.
If he's allowed to put his whole body weight into the punch then it's more likely a fighter scores a KD or KO
But a lot of guys don't sit down on their punches
Also depends on if opponent Has iron chin or not