No question Thomas is a talented safety. He is also in the process of building a great deal of animosity in Seattle:
http://sports.mynorthwest.com/49483...sforms-to-object-of-scorn-for-seahawks-fans/?
Whoever lands him gets a guy who can play, and also a guy who brings a lot of drama. A GM has to weigh the good and the bad, and evaluate how this might affect the locker room.
Of course, fans have no such burden. If the GM brings in a player and it doesn't work guy, fans simply blame the GM.
Which perhaps explains why Thomas, for now at least, remains a Seahawk. A disgruntled Seahawk.