Re: Projecting Janish
In the FWIW department, Fangraphs has him at 0.5 WAR to date (BP at 0.4). Obviously the sample sizes mean the numbers tell us basically nothing in terms of prediction. However, if he were to merely keep this up, we're looking at an above average player.
Great defending SS who can merely hit at a replacement level are harder to find than might imagine.
That said, he's certainly not doing anything to hold off Cozart, should he show well in AAA.
Games are won on run differential -- scoring more than your opponent. Runs are runs, scored or prevented they all count the same. Worry about scoring more and allowing fewer, not which positions contribute to which side of the equation or how "consistent" you are at your current level of performance.