text: So here comes the first hard push of Denver's merry-go-round of mediocrity.
  Trevor Siemian, a seventh-round draft choice three eons ago, is now officially on board with coaching license to kick up his heels and squeal whenever the merry-go-round goes 'round fast enough or too fast.
  Yeeha!
  On the outside, pulling with all his might, is Mike McCoy, offensive coordinator. His job is to resuscitate a moribund attack that Siemian guided last year. Denver has to overcome a marked proclivity to fail on third-and-short, downs critical to maintaining drives, long or short.
  Siemian also has to find a way to incorporate a running attack that disappeared often in 2016-17. CJ Anderson, a Fat Rat, or el fato rato, struggled mightily to score from one yard out in Denver's turnover feast win over host San Francisco, 33-14.
  Anderson tried three times to bust over and, on his third attempt, Anderson burst into the end zone. Yawn.
  A plodding running attack will doom the Broncos and leave them badly blue.