Does it make sense building a wheel using a 2 or 3 cross pattern and aero (bladed) spokes? Or are aero spokes used with radial lacing only?
Bladed spokes are used on rear wheels, which must have cross lacing on the drive side at least. Disc brake wheels obviously require cross lacing front and rear too.
You'll tend to see bladed spokes with low spoke count and radial lacing together because they are all elements of higher performance wheels. However, I don't see why bladed spokes would not give some (perhaps slight) aerodynamic advantage if used on high spoke count 3-cross wheels.