So, as the title says, Hashirama battles all the current Hidden Leaf ninjas, except of course for Naruto and Sasuke. By "current" i mean the present time of the Boruto manga. Hashirama is alive, in the prime of his life ( meaning his VOTE fight with Madara i guess). There are no restrictions, he can use any ability he has, including Sage Mode if he needs to.
There are no restrictions for the villagers as well.
Do we know that lee can even open the 8th gate?
No confirmation really, but we know that at this point in the story, Lee has surpassed Guy. Take that as you will. Personally I believe it means that Lee can open the 8th gate as well, but others choose to believe that it only means he has more raw Taijutsu ability now.
in the 4th war, he opens at least/max, to the 6th gate. in the last, he opened it without having to open the other 5. only someone on guy's level (or higher) can do that. in the boruto movie, he is stronger than even, so he is probably, by my assumptions, close to 3 times stronger than guy...imo