Actually that is not really an improvement in OBP -- it is just double-counting his improvement in AVG. (His "isolated discipline" -- OBP minus AVG, or reaching base other than getting hits -- is actually down 5 points.) Likewise, the OPS improvement is doing a bit of double-counting too -- a single will improve both OBP and SLG. So you should expect a 52 point increase in AVG to produce at least a 104 point increase in OPS, assuming the walk rate is constant. His "isolated power" (SLG minus AVG) has improved by 21 points, but that is pretty small, basically 3 total bases. (I notice he has 2 triples already, and minor league triples are usually pretty suspect for non-speed players. Downgrade those to doubles and it mostly erases his purported isolated power gains.) His big improvement is BABIP -- up from .265 to .356. Again, for a non-speed guy, not sure I would count on most of that improvement staying.