If the offense is bolstered by a significant acquisition (ie. Cano) and the pen is shored up, then we won't necessarily need any significant arms, just solid ones. Any of Haren, Burnett, Hudson and Jimenez could fit the bill. With a rotation already consisting of Dickey, Morrow, Buehrle, Happ and Hutchison, we probably only need to add one short term veteran into the mix and will need at least 3 capable arms ready in AA or AAA.
Realistically, the only capable arm in the minors who may be ready to legitimately contribute in 2014 is Nolin. Jenkins may offer a temporary stop-gap as well, but not someone we should count on. If contention remains the only option then AA has to bring in 2 more solid SP options into the high minors, find a legitimate 2B (Cano?) and bring in another veteran SP on a short term contract.