It's impossible for them to go from marka to ceelasha biyaha.
Think about all the security checkpoints they would have to go through.
Those al shaytaan that attacked ceelasha biyaha were probably hiding in Afgooye corridor probably degmada Xaawo Cabdi or other areas in between Afgooye and Xamar.
kkk dhulkaan mataqaanid aa u malaynaa anaa ku dhashtey oo caano xaskul hawiye la I cabsiiyey
Al shabaab has strong support between the river north west of afgooye from tisxiile to walawayn(murursade, garre and gaaljecel) tisxiile is murursade, balidoogle is garre from there starts gaaljecel who dominate the highway between leego and buurhakaba and yaaqbariwayne
The road your talking about is HG-ceelashabiyaha-lafoole-wacdaan cusman- vs biimaal and galadi from shalaanbood side, number 50 and marka
So SNA is basically hiraab vs biimaal, murursade, garre, gaaljecel who r pro-al shabaab...take example from this battle it's a murursade vs abgaal
http://caasimadda.com/dagaal-ka-dhacay- ... agu-gubay/
Go to Google map and write in ceelasha biyaha..you will see jiinka macaani and jabad geele there is where al shabaab enters from ceelasha biyaha, dayniile and heliwaa/huriwaa(pro al shabaab duduble)...all the baadiye between dayniile and afgooye is murursade
I have written arabic piece on NISA and said it won't work until it's forces r formed from HG, murursade, biyomaal, garre and gaaljecel bc xamar attacks r planned in there and they send their suiciders from there.
Amisom in there is Burundi apart from the US backed special forces in balidoigle
http://www.bbc.com/somali/war/2016/01/160104_al_shabaab
Blood, whatever! The area your talking is not on the coastal al shabaab controlled side after cadale