That is a judgement call by the team. If they think bringing DeRo back in and not renegotiating his contract (therefore having an unhappy player all year long) is worth it...then by all means go right ahead. That is perfectly within their rights. Just the same he is rightfully entitled to take measures to leverage a better contract either by finding a buyer for his services at a higher price that will require TFC to answer inquiries about their player (like he has tried to do with Celtic) or by using media to his advantage and making sure everyone knows that he is unhappy. Which is what he has done and you guys have chided him for doing. That is HIS prerogative.
There is an easy solution in all of this but that ball as you rightly point out, is in TFC's court. Pay the man better and put this behind everyone or not and face another year of whatever consequences befall that decision. (ie. drama)