That is true a lot of the time, but there are exceptions, i.e. Arata, Saito, Aoi. Though he doesn't show off his integrals very often, Arata is very good at them. Saito is another one that is great at integrals and is also exceptional at 2 diabolos. Lastly, Aoi is similar to Arata in that he is also very good at integrals along with 2d and 3d.