Some things are agreeable... but minato or tobirama wouldn't fall to a genjutsu being a sensor type ninja he could sense the build up of chakra before madara cast it(or simple avoids it same with tobirama) minato can teleport anything him or his chakra comes in contact with so all he has to do it throw his kunai at susanoo and he could teleport it,(like he did to the black chakra spears which are on on a much higher level than a bloodline limit or bloodline expansion)and it was proven that madara and his susanoo could become separated when garra removed him from it with his sand(why else would madara resort to using preta path when he could have simply activated susanoo again?)tobirama's ftg isn't as advanced as minato so I would know what method he would use for defeating it though I think he could find some way of getting past susanoo using his own usage of FTG.Its for certain that minato will be able to get past susanoo(plus you have to take it in to consideration that minatos clones can also use ftg, So im not saying minato or tobirama would win but they won't lose...mnato definitely has a better chance though, and because he's still faster than madara(which also plays a huge role.