The way the Cubs look at filling their pitching needs this winter, the bullpen gaps — including the closer — are the least of their worries. That’s why much of their effort and resources are being earmarked for their pursuit of at least two starting pitchers, at least one of whom they can project as a middle-of-the-rotation-or-better piece in the wake of Jake Arrieta and John Lackey entering free agency. The key might be former Rays right-hander Alex Cobb, who looks like the top free-agent fit for the Cubs and who seems to agree, considering recent comments he made about the team during an MLB Network Radio interview. Those close to Cobb say clubhouse chemistry and personal fit, along with the chance to win, are his priorities as he sorts through an early list of suitors numbering close to 10 teams. The Cubs already have his first big-league manager in place and just hired the only big-league pitching coach he has known. Plus, sources say the Cubs have had multiple preliminary conversations with Cobb’s agent, none of them involving any kind of contract parameters.