Rocko's didn't kite outlaw/convictball on fight order. On shift+mouseover, outlaw showed a very small attack range circle.

So technically, they just have a low attack range with very high AoE? They do however, attack stuff outside this attack range.
Could this even be the reason why rocko's don't kite them? Are they trying to stay outside of enemy's unit his range or do they try to keep the unit at their own -rocko's- max range?

Rockos don't kite Convicts. There should probably be a mode which makes anything kite everything.