I don't get your argument at all jung. Because the rotation is full of question marks the need for a shutdown bullpen is magnified, not the other way around. The O's of last year proved how far mediocre starting pitching with a decent offense but a shutdown bullpen can take you.
Your argument is a house of cards. The fact that they need to address the SP is in no way, shape or form associated with the need to form and maintain a strong bullpen. They are separate parts of the same entity. Without a strong BP, strong SP loses a lot of its value.
The best way for the Sox to give themselves a fighting chance is to fortify the club as much as possible, and the only area where they can strengthen the ballclub is not SP.
I very much see Dojji's point of stockpiling high-leverage relievers, because one thing that gets overlooked is that even though the Red Sox had a decent BP last year, it was absolutely terrible in high-leverage situations. The Red Sox staff as a whole allowed an .814 OPS in high leverage situations. That is unreal.