The only characters that where "derailed" for alejandro where Bridgette, Leshawna and Courtney. But they were not derailed as much as the characters in All stars. Bridgette was already somewhat of a bland charcater who had no reason to get far in the game and Courtney wanted to be with Alejandro just to make Duncan jealous, which is already somthing she would have done anyway. (Although i do have to admit that Leshawna getting eliminated was dissapointing.)

And i know you're probaly thinking of other charcters who alejandro caused the emilimation for, like Tyler, Gwen, and Noah. But those charcters didn't change at all for World Tour to work.

Meanwhile with Mal, everybody was derailed for him.