Kalho, Rivera & Trostky

Frida was a gifted painter, known for her personal self portraits. Diego was considered one of Mexico's greatest muralists. Leon was a Russian revolutionary who eventually defected to Mexico. The trio were friends during the late 1930s, although  two of them eventually developed an intimate relationship. So which two do you think makes the best match? The two painters? A painter and the revolutionist? And which painter?