After getting a chokeslam, Erwin kept mumbling "monster, monster", but Randy did nothing afterward. He kept Erwin's position as the Garuda's vice leader as his purpose had been achieved.
It was impossible for him to kick Erwin out, it would only lead Erwin's supporter more discontent against him which from the start who didn't have a good impression of him, he would let Erwin stay as the warning for them.
Also, Erwin was not less strong than Udin and Gusti. Erwin only needed teaching to make him understand and he would be honest in the future, not becoming pretentious like now.
After solving Garuda's issue, it was the time for his experiment about the food. If his the food they ate would increase the stat by using King Grade Beast or above, then it would incredible boost for his guild.
It must be known he could only get a stat each time he leveled up, so if he could increase his stat just from eating then Happy Guild's future would be bright.