Acquiring an ace, no matter your place... in the standings: an ace pitcher is the first step in turning around a franchise.
Yes, he can elevate a contender to a title team, but he can also go a long way in solidifying a loser to competitor, and pretender to contender. Number crunchers just have to stop looking at this one pitcher's stats, and consider the other, intangible ways he may boost a club... some of which include instilling a winning confidence in the defense behind him, taking the pressure off his offense, and resting a bullpen; not to mention inspiring/and-or teaching the rest of the rotation how to win.
Evidence in every decade of my lifetime as a fan: Jim Lonborg in the 1960s, Luis Tiant in the 1970s, Roger Clemens in the 1980s, Pedro Martinez in the 1990s+, Curt Schilling and Josh Beckett in the 2000s, Chris Sale in the 2010s. Each completely changed the narrative in Boston, a place where heavy hitters were always prevalent, but often lacked the pitching to go very far...