Besides for this unlimited blessing needing to come through the name Elokim, it also needed to come to Yaakov without Yitzchok knowing who he was blessing. Rather, as Yitzchok afterward told Eisav, “your brother came in stealthily and took your blessing” (Bereishis 27:35). This is because the blessing is from such a high level that it could not come limited in a revealed conscious awareness.
This is similar to what the Sages said (Moed Katan 28a): “[the flow of blessings into the material world] is not dependent [solely] on one’s merits, but [mainly] on Mazel (a lofty spiritual force).” This is because a person’s merits allow him to receive what he deserves from Hashem’s Light as it already is revealed in the Order of Hishtalshelus. This is not the case regarding the “Mazel,” i.e. the flow of Light from beyond the Order of Hishtalshelus is not dependent on a person’s merits, since it is from a level “higher” than being affected by a person’s actions in this world. The flow of Light from beyond the order of Hishtalshelus is even above the calculation of a person’s merits, which is a logical calculation of what someone should receive.
