Maybe its a personality thing but I love when holtby comes on because he does generally lift the tempo and has invarably had an impact on most games.
JD on the other hand hasn't as yet had the same impact coming on as sub- and I thiink will get more ****ed if he doesn't get more involved. He, rightly or wrongly, is judged on goals scored, which means the longer he carries on as supersub the more selfish he'll become when he comes on, the more trigger happy he'll be. The worst, and sometimes the best, of JD is his singlemindedness to score goals.