you have literally no evidence he was boosted. you can only use an example of how others react. If I can't use madara then you can't use the feats of the alliance
oh?,then ill just use sasuke's own feat.
He couldnt ake a legged susanoo before the chakra cloak,his arrows were deflected by 3 chakra rods,couldnt pierce through a stony pillar.
When obito deflected his arrows,he chose to deactivate susanoo and run,rather than use a full bodied susanoo.
The best thing his susanoo sword cut was a juubi clone.
After he got the chakra,the FIRST thing that happened was a legged susanoo the size of naruto' BM,and a long sword. Then after that he got senjutsu chakra from juugo
sasuke himself had a cursed seal which boosted his powers,so the cursed seal he was using,boosted his susanoo powers as well and allowed him to hurt obito.
That is a lot of proof.
It was said as a manga fact that naruto's chakra boosted powers,kakashi a fellow sharingan wielded had his dojutsu boosted to the point on using kamui on a bijuu with no problems,hinata deflected a juubi's tail.
The same chakra that was given to them,is the same that was given to sasuke,however the susanoo madara has,is not the same as sasuke,so you cant take a feat of one and give the other. Madara's susanoo cant use enton like sasuke either,they r not the same thing.
While i may agree on sasuke making a legged susanoo on his own since he has the skill,the power he would use is much much below as of now,as proven.