OPS is a convenient stat when you want to undersell a no power high contact speed guy.
One of the differences between extending Revere now, compared to Blackburn, is that Blackburn was coming off two of the best seasons you could reasonably expect to get from a guy with his stuff. Guys who get no strikeouts and rely on batted ball luck and borderline strike calls have very low floors, as we all know by now. The luck Blackburn had in 2008-2009 just doesn't go on for years on end.
Revere on the other hand, has his value preserved by speed. Speed is a large part of the reason Span's deal didn't prove a bust when his luck returned to earth likek Blackburn's. Yes, there is risk Revere breaks an ankle or strains a calf and he becomes worthless until healed. Injury risk is part of the genesis for these team friendly deals in the first place. But if he doesn't miss significant time, then worst case scenario we get more of what we've already seen with Revere's .308 BABIP and ultra low walk rate. There is a cliche, "speed never goes in slumps." Advanced stats are starting to prove the truth in that. Speed that is as elite as
Revere's is worth roughly 2-3 wins/year on average, in just baserunning and defense. That, or production a hair below that, is his floor.
The ceiling is something like Juan Pierre's age 25-30 seasons where he had a couple .320, .340 BABIP years. I believe that Revere is capable of improving his ground ball tendencies and improve his walk rate by just taking more pitches in hitter counts (Pierre hit the ball on the ground 61% of the time in his age 24 season), during his arbitration years, and then the savings will start to be realized.
There is also the fact that where Pierre was peaking towards the end of the steroid era, Revere is peaking during a time where the stolen base and speed are more valuable than ever. The break even point on stolen bags is down to like 64%. Its ridiculous. So there is some marginal value there just by virtue of how his arbitration years line up with leaguewide trends.