"The Chiefs can get by with an average LT because Pat can run away after his protection breaks down" is a less than convincing viewpoint.
This is still the NFL and stud LTs are at a premium for a reason. I still remember Pat limping around and screaming in pain because one guy got through and almost ended his season. Yeah, he can scramble with the best of them but an elite LT would give him more time in the pocket. Last season, on his excellent youtube channel Kurt Warner broke down over a dozen plays where Pat missed seeing a wide open receiver -- often for a TD -- because he was running around dodging defenders.
I'm looking as much into the next 7 - 9 years as this season. I would like to see Pat enjoy a long, healthy, productive career. An elite LT is crucial for making that happen.