Does left-hander John Danks’ return, assuming he’s back to full health after shoulder surgery, make the starting rotation good enough to keep the White Sox in contention in the American League Central? By letting catcher A.J. Pierzynski and third baseman Kevin Youkilis walk away in free agency while making non-marquee names Jeff Keppinger and Matt Lindstrom their ‘‘big’’ free-agent acquisitions, it’s probably a good thing the Sox lowered most of their ticket prices. The rest of the division spent more to get better.