I'm sorry to get in this.
But...every Kage standing there is a LEGEND. They all but one is known to have fought Uchiha before. Noone is scared if one Ichiha kid with MS. These guys are of a high calibre.
True they are not up on current events BUT every powerful ninja of "today" is compared to these guys in some way.
Hashi= most powerful ninja ever! Madara is using some of his jutsu to destry hundreds of ninja in the war.
Tobirama=unmatched Time/Space jutsu, huge water jutsu with NO water around.
Hurizen=taught by BOTH brothers, teacher of the Sanin.
Minato= genius who defeated "Tobi" by figuring out his jutsu after moments if meeting. Only reason he died, is to protect Naruto and seal the fox. Otherwise he would still be the current Hokage!
Besides Sasuke has not trained with anything extensivly, far as MS. Except black flames he can summon and un summon them. He has that lack flame Susanoo though. But...Time Space jutsu trumphs Sasuke. He couldnt vn keep up with Raikage.
Tobirama would not have executed the Uchiha. Then harvested some of their eyes. At most he would have taken out the leaders of the coup, to aet an example. Thats what i think.