What sort of theory would predict that designers would create all of their innovations simultaneously? That sounds like a strawman argument rather than ID.
How do you tell? Maybe if you told us your theory of ID, we could evaluate the strawman-ness of my question. Until you do so, I have to assume it's valid. And, again, how do you know what a creator or designer would or would not do? Sonds like ID has a lot of unstated assumptions regarding the abilities and motives of an unknown and unknowable designer. Maybe it'd be easier if you just told us what they are.