Unchallenged? It seems a lot of players think that way but the numbers just don't back them up and it is not the truth. Maybe you forget that Stewart is there putting a cap on Mcs touches. Likely it's by design because the pint sized RB isn't thought to be able to carry the load of a bell cow.
Here's Stewarts carries of late. If you note he gets more work than Coleman does when Freeman is in charge.
Week 11 bye
week 10- 17 rushes, 110 yds. New trend or game flow?.. McCaffrey- 5 rushes, 3 rec.
Week 9- 11 rushes .. McCaffrey 15 rushes, 5 rec.
Week 8- 11 rushes.. McCaffrey 4 rushes, 5 rec.
Week 7- 14 rushes .. McCaffrey 7 rushes, 7 catches
Before those games his carries were a low of 8 up to a high of 18 per game.
Through 9 weeks (one was a bye) Coleman had 59 carries. That's 7.3 carries a week (8 actual games) and little threat to Freeman.
Through 9 weeks (non were bye) Stewart had 106 carries.That's 12 carries a week for Stewart who is used as a RB 1-B.
I stopped at 9 weeks here because Freeman missed weeks 10 & 11.
Weeks 7-10 McCaffrey only out touched Stewart 1 time.
69 rushes this year for McCafrey. Freeman has 116 and has missed 2 games.
57 receptions this year for McCaffrey. Freeman has 19.
Total touches for McCaffrey is 126. Total for Freeman is 135. I remind you that Freeman has missed 2 games and still has been used more (volume) than McCafrey.
Volume should be one of your main goals and the deciding factor when choosing between 2 equally talented RB's. The volume clearly is on a healthy Freeman's side here.