Fuzzy rule based system: Should rules contain all inputs and outputs?

Question

I am trying to design an FRBS using Matlab fuzzy tool box. The fuzzy system will be used to predict player's type based on the inputs and a set of rules defined by experts. I have 6 inputs and 4 outputs (types of players). The given rules do not concern all inputs. Specific inputs are used for each player type.

Is it imperative to include all inputs and outputs in a rule? Also is there a min/max of rules that an FRBS should include or does it depend on the experts expertise?

Thank you for your help.