His outstanding contribution was to keep the parishes together in difficult times when foreign missionaries were not around during the war. Yakobo Lumwe can therefore be counted among those actively involved in the first steps of the young church´s growing independence.
Jambo kubwa juu ya mchango wake aliotoa, ilikuwa ni kuunganisha sharika pamoja katika wakati wa matatizo, wakati wageni wamissionari walipokuwa hawapo wakati wa vita. Yakobo Lumwe anaweza kuhesabika kuwa ni miongoni mwa wale wenye bidii, waliojitoa katika hatua za mwanzo wa kanisa changa ambalo linakua katika uhuru. [46]