It's clear that the Mets are in the market for a player who could fill in for more then a few games at shortstop. If Justin Turner was to be the middle infielder on the bench the Mets have already said they'd only be comfortable using him a short for a day or two.
In regard to the farm as I chronicled in this post Jordany Valdespin is still learn short and will he appears athletic enough to make the transition his .925 Fld pct. shows he's still learning. Bringing Wilmer Flores would be more the a stretch at this point in his development.
So the Mets are in the market for a middle infielder, why haven't they signed one yet it's not like their expensive, Mark DeRosa just signed for one year If I had to guess they're hoping one will sign for a minor league deal.
The Mets have been linked to Jack Wilson and Ronny Cedano all off season but have not signed either, what could possibly be the reason it's taken so long, is the asking really that prohibitive. Now the Mets are being linked to Ryan Theriot, I can't see him being any cheaper then the others.
The Mets seem to have some standards in regard to the position as they allowed Andres Blanco to sign a minor league deal with the Nats.
Of course Omar Vizquel won't be filling that role, but if all else fails Craig Counsell might be a fit.