We did. He used them to open those warp apertures.
No what I mean is when compared to Guyot, Imakarum, Purgstall, Khan and even Waferdanos both Li and Edward dont do much. Both of them resorted to their strongest ability right off the bat and only used that one power but to be fare Edward didn't really get a chanse to do anything. Li contantly tried to cut Agito with a closing portal and never did anything else. He never uses his blades to try and slash Agito or engage him in melee, hell he could even use his warp powers to blast Agito in the face with his zoa-crystal beam rather then pissing about. The main reason Li and Waferdanos lost was because Li was over useing his apertures and giving Agito time to work out what was happaning rather then using the power to catch Agito off guard and finish him in one blow. Although I did like the Warp Aperture / Evil Lance combo he did with Waferdanos.
Li was very clever, the other Zoalords wouldn't of figured out his trick so easily. He also misdirected Agito's attacks, if he had been a bit more patient, or planned it out more, he might of had more success. But I think the Zoalords were in panic,thus they didn't plan anything out. Barcus was only observing, and should of been directing the battle in the very lest to help coordinate them.