I can understand if Dallas believes last year as an aberration. He had his lowest average (41.6) and net average (37.7) of his career. However, he's been coming down some the last few years.
From 2012-2016, He averaged at least 45 yards per punt, even though he was putting a lot inside the 20, and for most of those years, his net average was above 40. (He only had 18 inside the 20 last year and 17 the year before after a high of 34 in 2017, which explains his 44.1 yard averaged (41.4 net) that year.
The last two years, we've had a punter with an average under 45 and a net average under 40, and those are not acceptable numbers, especially with fewer downed inside the 20.