The overall strength of the Flaming Pheasant was not much. Since there had been no Sunheart involved during the formation of the blood beast, it hadn't become as strong as the other beasts had.
Despite the improvement of the Blood Beast forming technique itself, the Flaming Pheasant had still only managed to be slightly better than what it could've been.
However, because the beast had already been in the Immortal Origin realm during the time of its death, the Blood Beast that formed was still in the Immortal Spirit realm.
Alex tested the beast's intelligence for some time and also fought it, understanding just how great the new Blood Beast was. While the beast had no memories, it still had its instinct, which allowed it to perform actions that regular blood beasts could not.
Blood beasts formed of Saint Soul realm beast cores did show a similar tendency, but this was leagues better too.