Likely due to their loss in the first battle, a frazzled professor probably sought to add Tobias and Thorian Draegor both to the 3-on-3 line-up.
However, what should have been a dream team ended up suffering a defeat at the hands of Soren, Kairos and Ranya against expectations.
Tobias' contracts were still too exhausted and injured from his match with Serena, and he likely still sustained some backlash from the dead summon and was unable to use his gift.
Meanwhile Thorian's Basilisks, while powerful and could even turn enemies into stone if eye contact is made, weren't add effective against the Dark Moon lineup.
Due to their being a lesser dragon species, true dragons are immune to many of the basilisk's effects, not to mention the sense of oppression through the bloodline, making it unable to display the full extent of its abilities.