It is also because Hideyoshi fought with Mitsuhide under very favorable condition and won the battle and he became a tenkabito (a person who holds the reins of government) taking advantage of Honnoji Incident and as a result, obtained the largest advantage.
また秀吉にとって都合の良い状況で光秀と戦って勝利を収め、また本能寺の変をきっかけに秀吉が天下人となり、結果的に一番利益を得ていることから。