Who proved what with which data? Topic starter that you need at leat 1 regular pet, yeah maybe.
BUT while it is true that you need at least one non exotic pet you don't need the glyph if you have at least one none exotic, ... most of the time. Normally if you have 1 or more regular pets it will just fill up to 5 stampede pets with copies of the first regular pet, even without the glyph. I wrote "most of the time" because there is a bug that has been around where people complained on occasion that it would not properly fill up to 5 without the glyph, which afaik hasn't happen to me, ever.