LAS VEGAS — Back in September when Andy Reid notched his 270th career victory to tie Tom Landry for fourth place on the NFL career wins list, it triggered a thought that was part imagination and part logic: Reid had established a clear trajectory toward overtaking the three men in front of him and becoming the winningest coach in NFL history— good health willing. That prospect may seem a secondary matter here and now. On Sunday, the Chiefs seek to cement a claim to one of the most dominant eras in league history by becoming the first team to repeat as Super Bowl champions in nearly two decades…