He speculated on that one too (and everyone that's said to be available)
http://www.lonestarball.com/2014/10/27/7078057/mark-buehrle-texas-rangers-potential-offseason-acquisition
If Cafardo is right, and Buehrle is on the market, I expect the Rangers to at least inquire about him. The Rangers have had interest in him in the past, and he's the type of pitcher they are looking for this offseason -- a one year guy who they can count on for 200 innings, and who will be a solid #3 starter. If you think Buehrle is likely a 3 win starter for 2015, even his salary isn't really out of line -- you'd be paying him $6.3M per win, which isn't that much above FMV.
If you really want to get out there in awesome imagination land, the Rangers have long coveted Jose Bautista and Edwin Encarnacion, having pursued both players at various teams over the past two seasons, and I would bet the Ranger front office is spitballing the possibility of a Buehrle/Encarnacion (owed $10M in 2015, with a $10M club option for 2016) or a Buehrle/Bautista (owed $14M in 2015, with a $14M club option for 2016) package. That would likely require parting with a significant prospect package, however, as well as requiring Ranger ownership to increase payroll above where we expect it to be in 2015.
But getting back to just Buehrle, if the Jays are motivated sellers, there could be a fit here. The Rangers have a deep farm system that would allow them to part with some pieces without crippling the farm in order to get Toronto to swallow some more cash, and Buehrle would be a terrific placeholder as the team's #3 starter while they wait for Martin Perez to return in 2016.