i dont get why theres alot of people are so pissed
if the chapter was ok then its ok , if it was not then its ok too , it wont ruin ur life reading a bad chapter
any way
with that said , heres what i think is the explanation for every thing
1. obito is connected to kakashi through spiritual connection and chakra just like what naruto did to the alliance but through his sharingan this time , guess he held it enough to make abond with him
2. he possessed kakashi instead of transplanting his eyes which is not possible as they turned to ashes
3. naruto using all of his biju rasenshuriken forced the unstable chakra of kaguya to show up , guess we will see another form of jyuubi in the next few chapter
4. that huge ball is kaguya expanding into her original size before she lose control over her power and go berserk and her sons had to seal her i guess
5. naruto smile then surprise , it means that susano looks just like sasukes , my guess is that kakashi cloned sasukes ps and used his new power to mimic it , chakra copy if i may say , not ninjutsue copy
6. "lets watch over them together" so obvious that no one from the angry people here in the base had time to think about it , it means that his and obitos chakra were united as one and when this finish and he reach his limit we will see the normal kakashi with normal eyes
last thing , try to enjoy manga not to hate it , if there were mistakes then its normal , kishi is ahuman and he will make plenty of mistakes despite how good he is