There's a good bit about how strikers like Defoe (although the example used in the book is Owen) are detrimental to the way a team plays in general in Jonanthan Wilson's* Inverting the Pyramid. The main gist of it is that as the game has evolved just scoring goals isn't enough. Based around Owen himself asking the question "Isn't scoring goals enough?" As you might expect, the answer is no. Owen, as you might expect, was typically lacking in self-effacement when he asked the question, thinking it was enough. It specifically related to criticism from Keegan when Owen was playing for him when the former was England manager. I wouldn't know enough about Grabban this season because I haven't seen him play but it's perhaps noteworthy that even with Defoe's scoring record (and with Grabban even more so I guess) Sunderland were still pretty gash. That's not to put all the blame on Defoe of course but there's a reason that sort of player has become an anachronism - they don't give enough to the team as a whole and results suffer
*From Sunderland, as it happens