actually, i've also seen squads in green cover get pinned fairly quickly, but, to be fair, that might be because 2 members of the squad are actually in green cover (so the squad gets the green shield) and the rest of the squad is just chilling somewhere else. thats one reason why i often prefer bomb craters (yellow cover) over small green cover, simply because it is so much bigger and you KNOW that all members will get the cover.
The more you know post...
-First of all: AoE suppression works with accuracy values. This means that hits produce AoE suppression.
Objects that can be targeted with an MG will instapin whatever is near it. This includes vehicles, sandbags, tanktraps (?), etc.
Now you realize that you can abuse this to suppress squads behind green cover.
-Incremental accuracy is probably +15% for every 2 or 3 models in the search area in addition to the one being fired upon. This means that Conscripts or Rifles receive more suppression and damage in comparison to IS. This also has a HUGE effect if 2 squads are nearby, despite them been behind cover.
Already explained by @ElSlayer. Hitting the middle squad would also triggered an increased AoE accuracy as more models are affected, which would lead to higher AoE suppression.
@Crawler: shooting the rifle in the middle instead of the one in the left and everything would had changed.
Second burst on the other squad and reposition.
While it can be considered a blob it's not what you were asked before.
"Let's assume blob start with 3 units closely packed."
Because in that case AoE would had dealt with all 3 squads.
PD: a blob of 3 or more squads will always deal with any MG. MG are not bunkers.
@elchino7 250 doesn't reinforce and M3 can't upgrade.
Guard M5 reinforcing post upgrade is obvious bug which have happened a LOT in the past(grens/pgrens in 250 for example after rec acc changes).
I'm talking about veterancy and raw stats.
Ex: Grens having old veterancy buff including the extra range for Rnade