Garrison and Unit Creation (obstruction vs. footprint)

[wowgetoffyourcellphone]

I see that when unit create it spawn at 'front' of building at the edge of footprint. When unit garrison in same building is walks to the obstruction. Wonder why there is a difference here. I noticed this because I gave temple an aura texture (using the footprint size code and selectable code) and the healers spawned wayyy out at edge of the aura (because I made footprint big to make aura graphic the right size). Then when healer go to garrison in Temple is walk right up to temple and garrison inside. Discrepency in behavior?

Edited March 3, 2015 by wowgetoffyourcellphone