But this is different. And the reason is, he plays shortstop. Shortstop numbers are so depressed that Mike Aviles with a 79 OPS+ is going to end up a 3 WAR player.
Pedro Ciriaco is better than Aviles on the basepaths (last night notwithstanding) and he's better with a glove. Any offense advantage he has over Aviles is just gravy. Siri tends to swing at everything, but he hits a lot of linedrives.
There's no reason to pay some vet 3-5 million to be worse defensively and on the basepaths when we have Siri for practically free.
If Aviles is a 3 WAR player, than Siri would be a 4 at least. That's how bad SS's are these days. So let's not trade Ellsbury for Andrus please. (As some are so hot to do) Asssuming (probably correctly that Andrus is better defensively and offensively than Siri) the bump isn't that much greater and Ellsbury should be worth more than a 1 WAR bump. Not to mention Andrus will cost 11 million over the next two seasons. 11 million for a 2 WAR (2 years) bump? No thanks