That catcher you described, there were only 5 of them that hit at least 16 HR and hit .260 or above last season.
However, if you go by just the HR total, there were 13 of them in all of Major League baseball last season. The Pirates did not have one of them. Now, I'm guessing teams look at the tandem for production from the catchers spot. I'm not even going to look it up, because I'd bet the Pirates didn't have 16 HR's out of their catcher spot last season.
Interestingly enough, there were only 15 RF's that hit 16 or more HR's last season. However, there were only 4 who hit at least 30 HR's.
So the Pirates have their potential 16+ HR at catcher. If you can swing a trade consisting of Tabata and Hanrahan for Bautista/Stanton/Bruce/J. Upton then I"m all for it. However, if you can also obtain Napoli/McCann/Weiters/Avila/Montero also, I'm not only supporting you for GM of the Pirates, I'm voting for you for President of the United States.