I'm pretty sure in the scan it says "it's the fourth"
They noticed minato.
After he had appeared with the summon. Also, it should be near impossible for Minato to jump that high. The Jiraiya scan the other guy posted shows buildings next to the Snake Summon. The 'high jump' is done by concentrating large amounts of chakra at the feet, like how Sasuke did here:
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If Naruto jumped that high, then he had the luxury, given KCM. Minato doesn't have that Luxury, as Kurama at 100% is far too large. Believe whatever you want. An off-panel feat is an off-panel feat. He cannot jump that guy, as he's never done so on-panel. If he has, then show me the scan. Otherwise, you are just wrong.