I know the purpose of your post was to bring information in support of Johnson, but I believe even you are selling Cam short when you say he "doesn't shoot as consistently as Gibbs or even Ramon." In fact, one can make a case that he may be a more consistent shooter than either, if not just on par with either.
For his career, Cam is exactly a 40% three point shooter. If you take out the numbers from the RS season where he ended up redshirting (because of a shoulder that required surgery), Cam shot 40.4% for his RS Freshman and RS Sophomore years.
In Ashton's first two years, he shot 40.6% from three (and ended his career shooting 41%).
In Ronald's first two years, he shot 37.4% from three (and ended his career shooting 39.5%)
Another comparison is each players' sophomore year:
Ramon: 49-118 -- 41.5%
Gibbs: 78-199 -- 39.2%
Johnson: 78-187 -- 41.7%