Well, hypothetically, if teleportation worked fine on its own, then a properly working army could work just as well (I really recommend cap: 1, hp bonus can take of telepad hitpoints ). In other words, I'm sure the AI won't plan an invasion with telepads, but if it happens that a telepad unit ends up in enemy territory, then the AI should use it, as in Civinator's example. Whether that unit is an army or not, shouldn't matter.
I'll have to test - given some of the (in)consistencies we've all encountered, for all we (or, I, anyway) know the AI will loveto teleport to armies, making a capacity > 1 certainly doable.
Best,
Oz