I agree fully.
I know that very recently I have stated that I preferred to have Bard in the pen and Aceves in the rotation. I am not a hypocrite. I've just given it more thought ( dangerous to know that I am thinking! ) and have done an about face.
I'm of the belief that Aceves is more valuable in the pen because he is versatile. He can go long relief, mid relief, and set-up. And with his experience starting for the Yankees and the Sox, he can make spot starts and even move to the rotation if needed.
Bard...... I loved watching him pitch set-up. But he has real upside as a starter. In the 5 spot he will be afforded the opportunity to continue his development as a starter. He is a work -in-progress. If viewed in this light, it all makes more sense. At least to me it does.