Leonel was just one person. Before he even battled White Knight Diore, he had already tired his mind using so many wind spells. After this battle, he was even more spent.
Leonel finally steadied his breathing and looked around at what was left of the Predator Ravens.
Unfortunately, Leonel didn't have an easy method of controlling these beasts. His horn was designed for Third Dimensional beasts. But, even then, he couldn't precisely control those Third Dimensional beasts, he could only rile them up into a frenzy and give them simple commands like pointing out a target to trample and targets to avoid like he had done in his final battle on Camelot.
This time, what Leonel had done was even simpler, he poured his Dream Force into the horn in order to influence these massive predator birds. Essentially, he forced them into temporary madness and this was the extent of his abilities.