Mack and a 2020 first for Chris Carson (Dynasty)

With the fall of Mack’s value, I have been concerned about my team’s lack of a third strong running back. A few teams in my league have great trios and I thought I did too (Mack, Kerryon, Kamara). I have Miles Sanders and Singletary on my bench but I think it will take three good backs to win this league (2 Flex). Is the upgrade worth a 2020 first if I think I can take the title home this year?
Any thoughts on the value of Mack is welcome

I love Chris Carson but the 2020 draft class is suppose to be loaded. I am not a fan of Mack now that Luck is gone. With all that said give me Carson for sure!