While Fuller doesn't have any single stand out physical attributes, when taken as a whole he is a really well rounded athlete. And when you look at what Emery has always looked for in his WRs (and this is his most well established trait, that we can trace back all the way to his time in Atlanta), it makes sense he'd like similar things in the guys who have to defend those WRs. So height/size is definitely important and overall physicality, body control, and instincts are important. These are still athletic traits but much more subtle traits and probably harder to quantify (unlike a 40 time). Now granted his other two CB picks did not fit these physical traits but they were also late picks and u just won't find size like that out if day 3 CB.