Uh, you might want to add in the 16 games played by Murray. Plus playoffs. Yes, he's taking chances, and they could blow up in his face. But let's not be so selective with the facts.
Your right Murray is solid as a rock when health is concerned
2013 Knee Murray sprained his MCL in week 6 and missed the following 2 games
2012 Leg Murray suffered a hamstring pull in training and missed OTAs
2012 Foot Sprained foot against Baltimore and missed the next 6 games
2011 Ankle DeMarco Murray fractured his right ankle and was placed on IR missing the remaining 3 game
2011 Leg Missed first 2 preseason games with hamstring issue
2008 College Leg Pulled a hamstring and missed a game
2007 College Knee Dislocated his patella and missed the folliowing 3 games
or my fav Ryan Mathews
2014 NFL Knee Mathews fell uncomfortably (face first with 3 300lb linebackers on top of him) and was carted off the field with an MCL injury. He is expected to miss 4-6 weeks
2013 NFL Leg Mathews re-aggravated a hamstring injury in week 12 against the chiefs. He left in the 3rd quarter and was not able to return but played the following week
2013 NFL Head Mathews left in the 3rd quarter of the week 5 game with a concussion. He was able to get cleared to play the following week
2012 NFL Upper arm Fractured collarbone and had to leave the game, missing the next three games after undergoing surgery.
2012 NFL Upper arm Placed on IR due to a broken (left)clavicle he sustained in the game against the Panthers.
2012 NFL Head Missed 4 games with a concussion
2011 NFL Calf Left game due to calf strain
2011 NFL Hand Fractured hand and left the game
2011 NFL Calf Matthews aggravated his calf during practice. He later missed one regular game.
2010 NFL Ankle Sprained right ankle ligaments and left the game vs. Jacksonville Jaguars. He then missed another game.
2010 NFL Ankle Aggravated his right ankle and had to miss the next two games.
2009 College Head Suffered concussion and missed 2 games
2008 College Knee/Foot Fractured foot and missed 5 games
2007 College Upper arm Fractured clavicle and missed one game