The FT shooting % in the table generally reflects the scoring ability of the individuals. Those that can score... Russell, Loving, Kam, and Diop, are shooting FT's O.K. The bottom feeders on that table are the offensively challenged players that have been getting more time because they are generally better on defense or rebounding, or bring a higher energy level.
As to the % over the first half of the season compared to conference games, Amir's playing time has migrated to Lee (53%), and Loving's time has migrated to Tate (54%).
Matta's offensively challenged senior class is not among the top 4 shooters. This is a team of one-dimensional players. Those that can score aren't especially good on defense, and vice-versa.