Let us not over look the sacrifice of K-2SO
That level of sarcasm will be missed
On the Tarkin thing, I'll have to check but I believe Tarkin was physically larger, both in height and musculature, than Director Krennic. This would have been difficult to pull of with a man of similar age, because of the human shrink factor. I think having Tarkin larger than Krennic was a calculated element meant to help convey Krennic's ineffective rage at being upstaged by Tarkin, and how much of a pawn he really was despite his obviously chocking aspirations.
Puns are always welcome in good Sci Fi ;)