Okay.
4 Kurama avatars while 2 of them is coated in Perfect Susanoo's would mop the floor
No, Kakashi's addition here is nigh useless, his PS is trash in front of Sasuke's, let alone Madara's. Kakashi's merged Avatar gets cleaved in a heartbeat and don't even try to claim it's tanking Madara's offensive.
Madara especially Sasuke's Kurama + PS would tank his slashes
Their individual avatars are significantly weaker than Madara's, Sasuke's layer of Susano'o gets torn open and Naruto to follow, the avatars don't combine and multiply in durability, they are simply layered on each other, therefore no significant boost in durability on either end, just a cloak to boost Sasuke and two layers of defense, which don't make a difference here.
TBBFRS explode when Naruto allows them to
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throwing them back would be useless Sasuke could also use ameno on one of them to make it warp near Madara then explode
Are you implying a singular BDFRS is enough to obliterate Madara's Susano'o? Because that would also imply Sasuke is capable of cleaving through Madara's PS, which is absolutely false. Madara's Susano'o is boosted by Senjutsu and contains Rikudo chakra, so the Goudama properties of the attack are negated, and FRS/Bijudama are what's left, which causes low to moderate damage at it's best. Not to mention Madara can instantly switch with Limbo at will, and let's not forget that Madara and Hashirama somehow survived Quad Juubi TBB without Edo Regen and Madara was shown with just an aura of Susano'o chakra left.
With Kakashi he was able to warp things Juubi size with half kurama cloak Kurama cloak + Rikudou chakra means he has no problem warping things that should dwarf juubi itself. Naruto allows him to warp TBBFRS right in Madara's face Destroying his susanoo Tbbs with ration susanoo sword in them would also cause Madara damage Kakashi should be able to even use Kamui raikiri through Susanoo,like Sasuke was (Even though this is far fetched) Madara gets raped.
-Kamui Raikiri is useless here, as that would require Kakashi to get up close and personal with Madara, and it's already been concluded that his Susano'o gets smashed, so that leaves him to warp near Madara, which he either gets outright evaded, due to Six Path's Senjutsu or Limbo knocks him out of the sky.
- Your entire argument hinges on whether or not all these avatars don't get smashed to nothingness, which they do, Madara's PS would be incomparably faster than Sasuke's normal Rikudo Susano'o in every way, including striking speed, so no, he doesn't get overwhelmed by a few Kurama avatars.
-Already came to the conclusion that Madara wrecks Kakashi's and Naruto's merge of constructs, so either Kakashi decides to go intangible in this process, or he dies. As soon as he does let up on this, a Limbo bashes his skull in.
wrong Sasuke would have a cloak when he merge with Naruto boosting his power before hand same with Kakashi.
Cloak isn't boosting it to the level where it makes up for the astronomical difference in power their avatars have compared to each other. EMS Madara's PS is Multi Mountain level, capable of slicing the tops of Mokuton hands, and 6-7 mountain tops in one 360° degree swipe, Sasuke's PS is around the level of low mountain level at best without any boosts from Kurama. Scale their avatars up, and we get the same results, except this time, Madara has more Rikudo chakra, and Senjutsu to back it.
Ameno to Madara's PS back like he did to Naruto would leave an opening or they can fight him in CQC to PS Kurama fusions plus 2 other Kurama avatars Madara PS would get overwhelmed or they could stall him while Naruto preps a charged Bijuu dama which would be warped either by Ameno or Kakashi on to or next to Madara.
Addressed. Anyways, night, got things to do tomorrow.