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For what it's worth, HQ says expect him to hit, but not like in 2011.
Adjusting the .363 BABIP down, and fearing the CT% / K rate you mentioned, HQ projects Avila for 250/350/440, as opposed to 300/400/500.
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Your overall point being that a 300/400/500 catcher, with a dubious glove, is a 5.5 WAR player so you don't want to let the glove hold you back.
Again, we could compare SS or CF. Nobody moves Ken Griffey Jr. out of CF because he's hitting 55 homers with a -10 runs glove ...