That first unit will have four scorers, so we're less in need of Fouss' scoring in the starting five. I predict Keita starts at the five.
BUT, Fous will ultimately get more minutes, and will likely close games, unless the opponent really has a dominant 5-man.
The question is with whom can Mag play...Mag can't shoot and isn't a scorer at all... I can't see Mag and Kieta on the floor at the same time, ever.