In today's Buy or Sell, Bill answers if leaving the bathroom door open at work is acceptable, if Pascal Siakam should have won conference finals MVP, if the Rockies will end up being the worst team we ever see, if Kyle Pitts is a draft bust, if Tom Thibodeau is the right coach for the Knicks, if Bill Belichick will coach at UNC for at least two seasons, if the Chiefs should build a domed stadium and if the Cowboys will pay Micah Parsons before Week 1.