The game system gave a compatibility score of 34%. This also meant that the chance of a successful fusion was at about a third. It was quite a low probability.
However, the Mutated Buddha Heart Lotus was so excellent that Zhou Wen couldn't bring himself to feed it to Truth Listener. He had no way of taking it out of the game after all.
As for the Mutated Skeleton Ant, although it was quite a good Mortal Companion Beast, it was limited by its Mortal stage. After having the Silver-Winged Flying Ant, there was a decreasing need for it. Even if he didn't fuse it now, it would gradually be eliminated in the future.
Therefore, after plenty of thought, he decided to risk it to fuse the two Companion Beasts together.