Interesting but i dont get it.
So larger target size helps the merge because it is closer to the other units?
So thats also why cons appear to move faster to me. The unit is larger and cover a larger area?
Target size (or received accuracy) only affects how likely a model is to get hit by accuracy based weapons and doesn't physically change anything about the model/squad.
Say a certain weapon has 50% accuracy at a certain range and is targeting a model with a target size of 2, the chance to hit becomes 0,5 * 2 = 1 or 100%.
So i was right so say cons have an advantage in closing down to engage/flank faster, especially for snaring?
No. Setting a route with shift commands is not reliable. Squads will move on to each next destination too quickly, especially if they have a bigger squad size.
If you want to compare the speed between two squads, you should let them walk in an equally long, straight line. All infantry should be moving at the same speed though.