I can't pretend to have any knowledge of Johnson's medical records. Obviously he has injury history, but this year was the culmination of a bunch of minor injuries, not major issues. If Johnson at present date is as healthy as one in his situation can be then the Jays should do everything they can to resign Johnson to a one year 9 to 10 mil deal and save the money to sign a catcher. If you don't even make an offer(assuming his health is reasonable) it just shows that you completely misjudged the talent in the first place, which means AA should be fired. I think he should be fired anyways. Johnson is going to pitch a lot better next year...even looking at last year he was one of the most unlucky pitchers in baseball(not saying he didn't pitch poorly)...his upside risk reward is quite attractive on a one year deal. AA is more likely to spend 14 mil per year for 4 years on a pitcher with far greater risk reward and on a guy who will never be a number one vs going after tanaka who is a risk but significant upside..
Option one would be to go all in on Tanaka. Option 2 I would do my best to sign Johnson for 1 year 9 mil...I'd do my best to trade happ and izturis for scrap...you obviously can't get rid of Romero..but it would be nice if you could..and I'd put all that into the most glaring issue of a catcher...you need someone who is decent defensively and a veteran who can call games...personally with our budget I would be after Ruiz....Roll the dice moving McGowan to the rotation and see where you are at with drabek, Hutchinson, Romero, Stroman..etc....You don't need those guys at the beginning of the year, but injuries will happen and you should be able to find one or two to fill the back end of your rotation....you need to have some of your internal guys to come through your system. We aren't the Yankees.