On a semi-related note, Rajai Davis has regressed to pretty much exactly his career norms, now sporting a .268/.317/.377 slash line, though has stolen 14/16 bases.
Are they still batting him leadoff??
He's an idiot in many ways, but he seems to overvalue his own overpaid pitchers in trade value, according to other GM's. Unlikely you'd be able to "steal" one.
(though in this market I'm no longer sure that 23-25M per season is even overpaid anymore for dependable starters)
I would give up Sanchez plus Lind or Francisco plus Rasmus or Pillar or another non-Stroman/Nolin prospect to get him (though they prob don't want Colby as a rental I realize)