Base Gai handled Obito's Kamui phasing/warp touching in CQC far better than Minato did. Minato was captured by young Obito's chain and had to use Hiraishin to dodge (
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) (and at that point he already knew that his opponent was able to phase through attacks), base Gai could jump in a fight between adult Obito and KCM Naruto saving Naruto at the last moment (
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) and fending off Obito that couldn't literally put a finger to him due to Gai's reflexes and taijutsu skill (
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)(
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)(
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). He countered Obito's CQC Kamui and even took the luxury to fight off Obito with his back turned. Obito was making child's play of KCM Naruto.
Base Gai could react to Obito's Kamui warp (of one of his nunchaku) and move during the time of the warp (Minato barely managed to activate Hiraishin and teleport away in the same time) (
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).
Gates enhance physical speed and strength by removing the body's limiters, they don't enhance reflexes. Base Gai is able to react to his own speed in Gates, even 6th (that blitzes Kisame and counterblitzes Sharingan and Rinnegan enhanced V2 jinchuriki) and 7th Gate (that pressures Juudara far more than SM Minato did), and even 8th Gate too (that blitzes Juudara and even reaches a speed high enough that his movement bends the surrounding space).
Gai's base strength casually destroys concrete (
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)(
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) and with his nunchaku he literallu pulverizes giant boulders like they were nothing, impressing Obito (
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). His skill is such that he can disarm Kisame from the Samehada using his ****ing legs (
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); please note that the Shoten clone wasn't Kisame at 30% of his general power, but Kisame with the same strength, jutsu, speed, smartness, durability and whatever the original had, he just had 30% of the chakra of the true Kisame.
His speed, reflexes and physical strength are over the roof even in base, obviously he is not as fast and powerful as he is with Gates, not to mention the special taijutsu moves he can use with the Gates. But in base he definitely defeats Chiyo, Yamato,
Hidan, Asuma, Zabuza, Darui, Mifune,
Tsunade, old Sarutobi. Depending on conditions he defeats Mei (he easily stomps her with a fight starting at short range, he probably won't win a fight starting at long range).
