This is probably the only post I agree with here.
-Minato obviously can use Sage Mode in battle if he wants. Don't know where the ridiculous idea that he couldn't came from as never used it before=/=Can't use it.
-On the other hand he obviously isn't as good as Minato with it and he obviously didn't gather Senjutsu in a second or two nor is his gathering ability anywhere near Naruto (current) or Hashirama's, as he clearly stated. "It takes too long".
-He obviously can't maintain it for up to 5 minutes either. He entered SM two chapters ago and was out of it by the beginning of last chapter. Unless you think the time in between this
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and this
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is a total of 5 minutes (in which case your ability to deduce time from manga scans would be very very very poor) Minato isn't holding it for as long as Naruto first could either. All that happened was him, Gaara and Kakashi getting beaten down by Madara, then Obito stabbed him and reaffirmed his resolve to Madara. That definitely wasn't five minutes. Lol When he said he can't maintain it for long, it clearly wasn't the same as referring to the drawback Naruto first had.