Here's one for you. Starting with facts that we can generally assume:
1. The Mets are, at best, one game better with Luis Castillo than they are with Ruben Tejada.
2. The Texas Rangers are "going for it" this year, acquiring Cliff Lee, Bengie Molina, and Jorge Cantu recently.
3. The Rangers all-star second baseman, Ian Kinsler, is out with an injury. And when playing, is very injury prone.
The Mets should flip Castillo to the Rangers. Even if the Rangers didn't give us anything back in return, selling Castillo over there for some salary relief makes a lot of sense.
Kinsler's current replacement is Joaquin Arias, who is probably below replacement level. Castillo could make a valuable addition to the bench down the stretch for a team with World Series aspirations. Most importantly, Castillo is only owed about $2 million the rest of this year and $6 million next year.
The Mets should offer Castillo to the Rangers for $4 million - half of what he's owed. The Rangers improve their team now, get insurance for the stretch run, and improve their bench. The Mets get salary relief without making the team any worse. Do it.