I don't know if I can get on board with Mitchell not having an obvious hole in his swing. I think he has a very Hiura-esque hole in the top of his swing. In zones 1, 2 ,3, 21, 22, 23, 31, 32, 33 in his MLB career Mitchell has 43 swings and 25 whiffs for a 58% whiff rate (69% in his brief sample this year). In Keston Hiura's MLB career he has 241 swings and 114 whiffs for a 47% whiff rate. So to this point in Mitchell's career he has a bigger hole at the top of the zone than Hiura does for his whole career.