The primary difference between George and Leonard is shooting ability, tbh, George is one of the best outside shooters in the league, while Leonard is a mediocre outside shooter..
George is a better ball-handler and passer, but like OP said, that was aided by increase in usage in Indiana's offense..until this season, George had major issues with ball-handling, like Leonard..
Kawhi with a broken jump shot simply doesn't fit with Parker, and Pop has not added any wrinkles to solve this problem, tbh..it would make sense to increase Leonard's minutes with the 2nd unit, which will lead to more touches, but it seems like the coaching staff is more concerned with his knees than his role..