Narrow or wide leaves can be deceptive too! Sometimes when crossing unrelated sativas you will consistently get plants with narrower leaves than either parent! I've seen African sativas do that. I'm thinking about a certain Meao Thai x Angola cross. Neither parent was super lean looking but the cross had needle like leaves. Also hashplant x tropical crosses sometimes do this. I'm pretty sure I could "hide" Lebanese genes into a tropical sativa for example and get plants with super narrow leaves. The leaves mean very little, so does our indica-sativa stoner taxonomy.
I agree 100%