Dalvin should look into who published the All-Pro team beyond "NFL or whoever". It's the AP and they are the most prone to excluding someone because they don't allow more than one vote at each position. Cook had a great season, but he did it in a year when another RB went over 2,000 yards. I'm kind of surprised Derrick Henry was not a unanimous selection. I expect Cook will get votes in the SN and PFWA teams.
If there's a surprise it's that Kamara got votes, with Henry having the season he did and Cook surpassing him in total yardage. I agree that's about his reputation and team success, but the only legit rationale would be Kamara leading the NFL in TDs with 21. Maybe Cook should blame his teammates and HC for that, especially for letting Kamara put on a scoring clinic on national TV about 10 days before the AP voted.