hmm interesting
No . My friend I believe it was the Uzumaki clan known for their chakra levels not the Senju. Well , true First does know about Susanoo but every susanoo is unique in its own way. So he really doesnt know about Sasuke Susanoo and abilities. Does matter we've seen many chidori variations . Amaterasu would be a problem considering Sasuke is the only person known to manipulate it and it cant be put out. Sasuke could easily summon his hawk or bring out susanoo. Last but not least Naruto used the fox chakra because he was out of chakra.
Hmmmmmm interesting
Senji are known to have a huge amount of chakra..... And it wont really matter with chidori...... Amutrasu well cause problem's but hey come on I think the 1st can handle it. Summon the hawke won't do much and plus i don't think he well have time to because the 5 kages past out quick.
He does really have chance but it's aiming at the 1st more.....
Sasuke's susunno might be stronger but in my opinion it wont hold up for long, again create forest use wood to trap.
Sasuke might have advantage over element, but it all depends on the amount exapmle..... Fire and water, water win's but if you got a padfle of water against a flaming room, the fire would win.......
The chakra that naruto took from nine tail's was way more than suske or naruto would have..... There was like 40 shadow clones with all high level rasangan....... But hey he would have a chance