The surveyed Wikipedia treatment names the individual member languages and the countries they are spoken in, but gives no combined aggregate speaker count for the Gur (Central Gur/Mabia) family as a whole.
What would resolve this A published aggregate count of speakers across the Gur family's member languages, for example from Ethnologue or a regional linguistic survey of Burkina Faso, Ghana, Mali, Togo, Benin, Ivory Coast and Niger.
OpenAfrican linguistics (Niger-Congo, West African languages).Wikipedia: Gur Languages