Is he that hard to find if he was removed what they give up
Idk he is either laying low or he died in an air strike as claimed by some. In the end it doesn't matter, Alshabab is inherently cancerous, leaders can die but the ideology is strong.
The only way is to remove them from the lands they hold and force them to be on the run. This will require a strong state. Currently all Federal states below galkacyo except the city of kismaayo and a few surrounding villages are militarily integrated into the FGS.
You have to understand Somalias military from a 2016 perspective. In 2016 the somali military was just a rag tag organisation of militias rife with corruption. After Biometric registration of Soldiers and integration of militias we have finally begun to form a continuous plan.
If you want to read some information on the plan of FGS i urge you to read NDP-9 developed by the ministry of planning. It goes into detail of how FGS plans to recreate Somalia.