Kamui > 8 gates?

[BraveStorm]

Yes. Once Gai opens the 8th gate Obito can simply retreat and wait till gai dies from opening the 8th gate.

 

[Champ]

Obito yeah. Guy can't harm him once he goes intangible

 

[BenjerminGaye]

A battle worn Gai lasted quite a long time in the 8th gate.

If Gai is Fresh, I think he can easily last the 5 minutes

It's not about him lasting 5 minutes but him having a 5 minute continuous attack. U know like konan's paper bombs.

 

[RedRobin]

Madara is faster thab Kamui, Gai is faster than Madara so Guy could hit Obito.