If LS were to have a base at DSA it could be ideal for them even though they are opening up a base at EMA and aswell as having their base at LBA.
The routes that could be offered from DSA would most likely be city and summer sun routes similar to that at LBA, whereas it seems the operation at EMA is geared more towards a niche market away from the ''bigger'' charter carriers to more mid-haul routes, filling in a void left by XL and a reduction in based charter flights. Thomsonfly showed the potential the airport had on these routes when it first started here, but with it's change of strategy they were steadily abandoned. Should LS set up base here (being the only non charter at DSA) they would then have the monopoly and control of how to control routes with cost and frequencies etc, so that it doesn't impact on their operations at their existing bases.
This same idea could also be said about MME. Located between its two main operations, LBA and NCL.