How many punters do you see getting the game ball, right? I know that his average and his net aren't among the best, but those numbers are trickier. For example, if you're punting from your own 45 yard line, 35 yards gets you into the opposing 20, which is liable to hurt your average while completing the intended objective. And you'd have to assume that every punter's goal is to boot it inside the 20. That's why Kern's net average of 45.6 with 22 inside the 20 in far less impressive in my eyes than 41.3 and 37. And as you've said, he might very well have the biggest arsenal among all punters.
i dont think its even a question to be honest - koch is a pioneer and is reinventing punting - he's at the forefront of his profession and everyone else is trying to catch up - there's no question he has a larger toolkit than any other punter in the league