Many people claimed Leon's BAbip last year was unsustainable, and I agree, but I never felt like he was going to totally revert to his "old self", since a good chunk of his uptick in BAbip was due to his huge increase in LD% and hard hit %. That is something that can, at times, be sustained.
Stat Career (including 2016) vs 2016
BAbip .337 .392
LD% 22.4% 24.7% (never above 18.8% before 2016)
Hard% 25.2% 31.3% (never above 21% before 2016)
I seriously doubt Leon ends up with an OPS above .800, and I wouldn't bet on .750 either, but there is no reason to think he can't do much better than he was before 2016.
On Leon's defense vs Vaz, the sample sizes for both are so small, and much of catcher defense is hard to quantify (see the whole CERA debate), but in my opinion Leon and Vaz are about even on defense. Vaz is probably a little better on pitch-framing and he may end up being better at throwing out runners, but CS% is over-rated. Leon does a great job blocking bad pitches and handling the staff. He may be slightly better than Vaz in those two areas, as of now. Both still have room to improve on defense, and one could pass the other at some point, but I think they are pretty even right now on defense.
I've always been super high on Vaz, but more and more, I'm beginning to think he may end up being the odd man out, when Swihart makes his case for the 25 man roster.
I still am clinging to a probable false hope, and I'm not even sure if I'm on board with my own idea, that at some point, we could go with 3 catchers, if we can find significant time for Swihart at DH, LF, 1B or 3B. I'm not against the idea of giving Swihart every chance to win the catcher job, and I'm not for teaching him how to play 1B or 3B just yet or improve his OF skills, but the thought is still in the back of my mind.
If we ever have a need at DH this year, I'd bring Swihart up, unless Travis is on fire.