--Myojinmon pins down every single bijuu before they do shit
Feats of myojinmon slamming down on multiple targets? Any bijuu that gets pinned down either reverts to V2/base or gets sucked back up into the GM, only to be re-summoned again. Then hashi has to deal with the multiple bijuudama being fired his way while he's trying to pin each individual one down.
Then chomei can fly so unless he's close to the ground then he'll escape the jutsu without a problem before he gets pinned.
followed by mokuton clones removing the stakes in each bijuu
Mokuton clones get knocked back via GM shockwave, obliterated by tbbs from the ground/sky [since myojinmon isn't pinning down every single bijuu simultaneously], or pinned down by obito with chakra rods.
or hashirama putting the bijuus to sleep through one touch thanks to kakuan nitten Suishu
Not happening when chomei can fly, & in any case as hashi is busy going for a grab then obito warps behind him & warps him away. & Before you say "hashi will have clones protecting him" then no that's not happening with manga intel. Obito can save his warp until hashi goes for a grab & since hashi has no info on kamui he won't be expecting a warp from behind during that moment.
--Mokuton clones then gang bang obito
They get phased through, then obito pins them down with chakra rods. Or he can simply ignore them altogether if you think he doesn't have the speed [which he does].
alongside flower tree world to bypass his kamui limit and putting him to sleep
I have no idea why you think this works even after the countless threads where I explained how it doesn't. Obito phases underground & away from the pollen, then he resets his limit. A bijuu blows the forest up, a juubi sized katon roasts it, the GM takes it out, & uchiha kaenjin prevents the pollen from harming him.
--GM is also non factor here when myojinmon pins it down
Not happening when obito can re-summon the GM to whatever location he sees fit.
or SM mokujin smacks it around, as SS isn't even needed
Hashi gets warped while prepping SM, mokujin, then charging in for attack. Alternatively mokujin gets spammed with bijuudamas.