VORP is far from being an end-all metric. You can't prove that any player is better than another based soley on VORP.
I do agree that OPS shows its flaws when you compare a player like Kendall because it favors sluggers and ignores base-stealing (although that probably helped him this year since he was thrown out almost as many times as he stole a base).
I think Total Average is a better overall indicator than OPS. I also posted the Equivalent Average numbers from BP. Kendall is not as good offensively as you're suggesting. At least not last year.
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Kendall .744 .280
Varitek .888 .299
Posada .878 .310
Martinez .820 .296
Lopez .834 .300
Rodriguez .854 .311
Total Average is better than OPS, but it's not very good. Here's a comprehensive ranking of player evaluation metrics
I'm not claiming that VORP is the best metric, but it's better than TA or EQA, because it's not simply a rate stat.
The problem with your analysis here is that you are relying on rate stats alone. One of Kendall's great values is that he is very durable. Since he plays more than many catchers, he ends up generating more runs. That's why when you take EQA and turn it into EQR, you'll find that Kendall was the top ranked catcher in the NL last year and number 4 overall.
In addition, these measures only cover hitting. Win shares includes fielding in its calculations, where Kendall also picks up a couple extra. Win Shares ranks him number one last year.
I'd argue that on pretty much every metric that counted base running, fielding, and playing time in them, Kendall would rank in the top 5 catchers the last two years.