Nice to see you on the Raf in CF train at last! I agree with you also about people getting overexcited about Mayer or Campbell at the moment - ST results count for little this early in. A lot of pitchers are working on one specific/motion this early, and hitters know that and can often get inflated numbers because of it. Alternatively hitters are also working on things, and sometimes take a while to find their rhythm.
~Most teams know who the majority of their 26 are, with a few positions up for grabs. The management will make their decisions on a whole host of things, least of all if a guy goes 4 for 4, or 1 for 11 in early ST.
There's a few different directions they may want to go yet, but inevitably, injuries will likely get involved to solidify things in the end.