Some of the Funakoshi's throws I covered in a recent event: 咽押 / Nodo osae (Heian Shodan), 谷落 / Tani otoshi (Heian Godan), 燕返 / Tsubame-gaeshi (Heian Godan).
Particularly in relation to the latter, one of the meanings of the verb 返す / kaesu, i.e., "to retaliate," was analyzed: the final fluent exercise shows precisely the Tsubame-gaeshi throw as a kaeshi-waza against a possible disruption of Tani otoshi.