Snake, a plot hole is NOT an excuse. Don't answer questions like that here.
Now, I'd like to think that even if Magus calls the other members of the team weaklings, cockroaches and all other words that could point to inferiority, he has more respect for them than he lets on: They've proven him that his wish could come true. A dead man, even one killed by Lavos, can be returned. To Magus, finding Schala means everything, just as defeating Lavos once did. He would return Glenn to human as a way of saying: 'Fine, fine... No point in making you suffer anymore, is there?' but he would also do this out of a certain emotion of gratitude, perhaps even comradeship?
You gotta remember Magus isn't void of emotion.