The Chicago Cubs could be getting two crucial arms back soon, but who will be the bigger X-factor for the rest of the season: Edward Cabrera or Matthew Boyd? Boyd last pitched on May 3, posting a 2-1 record with 31 strikeouts in 24 innings before landing on the injured list, while Cabrera owns a 3-2 record and 4.00 ERA across 54 innings after an up-and-down season that was interrupted by a blister injury on May 20. Luke Stuckmeyer and Joey Christopoulos break down which pitcher has the potential to make the biggest impact on the Cubs' rotation, Craig Counsell's playoff push, and the race for the NL Central crown. 

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