I expect Kontae to be an impact player, Lynch an nice contributor.
Gas, who knows.
I would guess that Lynch is further developed than Konate at this point. I agree with your assessment of Konate's potential but his development may proceed more slowly than we would like. I would say that Bakary was further along than Iowa's Gabriel Olaseni was as a freshman and he became a significant impact player during his last two years.
Also agree about Gaston. He showed so little during his limited playing time last year that it's difficult to have much expectation for him.