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Agreed w/ Matthew that rel=publisher is worth setting up, but KG is a tricky animal. On the one hand, Google is trying to do entity analysis, which may depend on similar factors (to a point) as traditional SEO, just from a different perspective. There are many cases, though, where brands that clearly are entities have no KG listings or just have an G+ box. For example, Amazon, Apple, and Wal-mart have no KG listing. Clearly, these are huge brands. K-mart and Taco Bell have G+ brand boxes. Some small local businesses (like Gene's Sausage Shop here in Chicago, which I used in my MozCon talk) have full KG boxes. Google does seem to tie some KG boxes to local one-boxes ("authoritative one-boxes"), which are the stand-alone pin entries that come after the snippet (and not in a pack or "near" result). That implies to me that there's still a preference to show KG boxes for business with a single brick-and-mortar location.