I don't know how anyone, knowing what we know now, could be opposed to signing Teixeira.
Worst case scenario has been realized. God help us if Lowell regresses in the 2nd half (fully expecting it).
A sub-.600 OPS is unacceptable from a position player, but getting out of a DH is simply unheard of.
Add in the fact that Lars is struggling in AA and may not be the 20x all star some thought he would in the offseason, and it makes the non-signing even more puzzling.