After 2 years, you should stop with "if Miller can stay healthy". You better be planning on him NOT being healthy. And I don't think you can rely on 30 year old Kamara to be healthy all year, either. Then who are you left relying on? Mimms? That's a loss waiting to happen.
1st Miller did not have to go on IR the 2nd time that was DA. Also soft tissue injuries seemed to be a lot less after DA was gone and that's all the Miller had. And you don't plan for a player to be hurt.
Maybe you should check out Derrick Henry's age and then see how many games he played this yr and he has a lot more wear on him than AK does
How about Aaron Jones , he played 17 games this yr and over 1100yds
I'm not saying we should not draft a RB, just not @ 9