Why are the implications of "Ka'asher Ta'asu kein Ya'aseh"?
Torah Temimah (citing Kerisus, 9a): It implies that, just as Yisrael became Geirim via Korbanos entailing the sprinkling of blood,
And not via a Minchah, so too, Geirim who convert. See Torah Temimah, 28. Refer also to 15:15:1:2.