Although they had only teamed up for one night, Weiser's abilities had already been recognized by everyone.
Other things aside, just the fact that she was always the first to guess the word suffixes meant she contributed more to the team than the Observer. Not to mention, she had the adaptable Thousand Mechanism Technique Spirit and a multitude of Magic Factions, which allowed her to deal with just about any special situation.
In the sixth Dream Bubble Shadow, if it weren't for her spontaneously changing Wind Skill and Sound Technique, Ash and the others wouldn't have been able to clear it.
Even without big data statistics, Mages from the three major Mysterious Factions were generally considered to be better at complex planning.
