SCOTTSDALE, Ariz. — Everybody wants something from Nolan Arenado, and the demand is growing. If a national writer steps into the Rockies clubhouse at Salt River Fields, the first thing they’ll do is head to Arenado’s corner locker, craving 10 minutes with the star third baseman. If the MLB Network or ESPN makes a rare visit to the Rockies, the TV crew demands Arenado, or center fielder Charlie Blackmon. If Arenado goes out to eat, fans want a photo or an autograph. I frequently track him down, asking for a quote, an insight or a precious 10 minutes for a podcast.