I don’t know. I think it narrowly turns on whether Ray really could have prepared his request sooner, or if the procedures really were only revealed at the last moment.
In favor of the state, I am familiar with big government bureaucracies and believe that they are generally pretty hidebound and predictable, for anyone who bothers to examine how they work. They really aren’t good at surprises. In addition, Ray made another last-minute request alongside this one (a change of execution method) that looks suspiciously like a stall for time.
On the other hand, I am prejudiced against Alabama and in favor of Kagan. So I’m left with vague doubts about the decision. But of course there is no reason for a court to share my prejudices.
Regardless, I am always against the death penalty. Even in this case. But if execution is inevitable as in this case, I don’t see good arguments for delaying it. You’re just postponing the disappointment.