The weight room this summer will be extremely important to everyone, most of all Henry, Gadsden, and Jones. I would put Gaines in this category, but he's been in a college level weights program for 3 years, so I don't know how much more good weight he could put on.
This roster is very versatile defensively. While Mbaye looks to be the only one on the roster that has the true size and perceived skillset of a "4", Blake Jones is a tall wildcard, Gaines will fight his a** off against whoever you put in front of him, Henry is probably more of a "5" but he would give Oduro a rim protector, and I know this sounds crazy, but TJ Gadsden looks bigger and taller in every picture I see of him.