reach the intended wide distribution on July 4th

The 'wide distribution' is achieved with a combination of content rewards as well as curation rewards. Both come from the reward fund mechanism and both will be distributed on July 4 so it makes no sense to focus narrowly only only the curation reward, unless the intent is to make the distribution appear narrower than it actually is. The curation portion has always been defined as both a benefit of owning SP and a superlinear benefit. Indeed in the short- to medium-term it is the only such benefit to SP (aside from upvoting your own posts, which does no good if everyone does it). As such it should come as no surprise that the largest SP holders receive the lastest share of the portion of the reward fund that is designed to go to largest SP holders. 

From what I have seen of the content rewards they are being distributed very widely to a large variety of different types of users. The primary exception there are the Steemit insiders, who gain a disproportionate share due to what I consider a glitch (possibly temporary) in the way the reward algorithm handles the small user base.