Fallacy, you have no proof that obito could even cast genjutsu while controlling kurama at the same time. It could've been too chakra taxing. Did minato say to himself that he needs to avoid direct eye contact? No, so your only proof is minato not getting caught in a genjutsu in a situation where it may not have been possible.
Lol You wanna play that game? MS activated before minato throws his kunai U_U
Ephemeral solos for pete's sake! XD
Nope we're talking about alive Itachi with more than enough stamina to end this petty match.