We see PS's slash trying to strike Hashirama here [Hashirama never dodged it.
Not only is RDS a last maneuver, if Madara kills him with PS before he ever uses RDS, it won't matter.
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], yet his golem was capable to block the slash(even better than dodging) [
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]. On the same previous manga page, he tried to strike with his second sword, and we see Hashirama dodged the attack [
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]More than that actually, Hashirama started to run away from Madara, escaping from his sight [
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] and Madara seemed unable to stop him despite the speed/strength of the PS's slash that you hype so much at his disposal, to the point he ressorted to long range PS's slash Bijudama in hoping to hit him [
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], something he still managed to outmanoeuver with a barrier [
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]So no i don't think PS can finish the Hokages especially not speedsters like Minato or Tobirama
I also know RDS is a last ressort, but if they feel they can't defeat him otherwise, i don't see why they won't use it
There is also the Hokage barrier they can use if they want to restrict Madara in a small place. Tobirama can divide his chakra in 3 while making the barrier like we've seen in the manga. So one of the clone can easily replace Hashirama. Even Jubi's Bijuudama couldn't destroy it and Madara(let alone EMS) is nowhere near Jubi in terms of fire power. After blocking Madara like that, they find a way to finish him off slowly