Photo by Ezra Shaw/Getty Images Jimmy Butler, Golden State Warriors The Golden State Warriors are facing a slew of challenges heading into their Friday matchup against the Denver Nuggets , with Jimmy Butler III upgraded to questionable following a back injury and Stephen Curry ruled out due to worsening flu-like symptoms. Butler missed the Warriors’ 121-116 loss to the Sacramento Kings on Wednesday but is expected to be evaluated closer to Friday’s game. Head coach Steve Kerr described Butler’s