They did 2 attacks within 24hrs it does not make sense for them to come thru Galgaduud side. I am sure they have been camping in between Ceel-Bacaad and Runirgood for sometime planning this attack. Because they have been so prepared that they have recorded videos and taken photos and are now posting over social media. Maybe if you know some locals over there try and contact them, they could potentially confirm that they have been attacked from within. That’s my theory.There are SNA in middle shabelle as well so your point doesn't make sense. runirgood is a border town between galgaduud and middle shabelle. they attacked from galgaduud side as they came from the north to ambush