Can someone show me genetics are anywhere near as important as food source/supply and habitat? I am betting they can't...

You can have the greatest genetics ever, but if you have poor conditions they will never be expressed. It's a basic principle in the management of almost any animal. You see it with whitetail deer too... You could have a buck with the greatest farm raised pedigree genes ever. However, if he lives on a crappy range his whole life where he's half starved, he'll be lucky to eeek out a 100 class rack. You put some run of the mill none pedigree bucks into high quality range, you're going to see some nice bucks. Sure, you'll have some duds... But, if you don't have good range, it doesn't matter how great the genes are.