No. Even if we ignore the fact that 8th gate is also a suicide tech & draw material by default.
Pre rikudo kamui users shit, well Obito does anyway. Same for Naruto due to clone fakes. Minato can just ftg to another country. Trollkage stands a chance too. Hax people like that.
Gai also has zero sensing feats I believe so anyone who can do chameleon style shit/hide their chakra can just outlast the 8th gate. Anyone that can be counter summoned also gets the **** out of dodge while Gai disintegrates.
Hell. Maybe even Ino could mind transfer while he opens gates :Sparks:
Also. Guy wouldn't have fatally touched Madara without Kakashi, Minato & Lee's help. :bdpf:
Sorry to piss on your bonfire...but all in all. The list of people that can win vs the 8th gate is quite large. I'm still probably missing more....
Edit: Adding Sasuke, Muu & Ohnoki. They could probably prep their jutsu while Guy opens gates.