1. learn the fact that madara was severly weakened when he was fighting minato. even then minato couldn't finish him off. also, if we're comparing madara and minato, we have to compare current madara vs minato when he died (obviously duh). not madara when he fought minato. he also have better space time ninjutsu than minato will ever have.
2. you forgot first had a lot more going for him than just his power to control tailed beasts. he had wood realease which a lot of noobs underestimate because of yamato, he clashed with madara countless times in their prime and ultimately came out on top. and for minato sacrificing himself to stop kyubi, do you honestly think he had other options? kushina said said that he didn't have to sacrifice himself to stop kyubi? then why did he? just to let kushina talk to naruto in the future? if minato was strong enough to defeat kyubi like you imply here, why didn't he just defeat kyubi? obviously he had no other option here but to sacrifice himself. or run away because if he had other means of stopping kyubi, he would've done so. minato was lamenting the fact that he could live a happy life with his family, and yet he sacrificed himself despite all that. why do you think that is? get real.
3. i don't remember anything about any context in the manga saying that 2nd had incomplete iwr or slower space time ninjutsu. it's all your speculation here. weak points not even worth refuting. come back with a more solid evidence based argument.
4. have you ever heard of something called age? you think minato will be as strong as he was when he turns 70? please. some common sense here. at the time of kyubi's invasion, 3rd was already RETIRED as a hokage. care to know why? because he was way past his prime and was getting old. yea. as for both iruka and kakashi saying that 3rd and 4th was the strongest, respectively, i'll leave it up to you cuz it's a matter of opinion of characters within the manga and we'll never find out who's the stronger unless kishi tells us. one thing i wanna say tho is that kakashi could be saying that just because minato was his teacher. just like you say that 3rd chose jiraiya becasue he was his student.
5. pain has more jutsus than minato will ever dream of having. that's a fact. first of all, his rinnegan enables him to use all 5 chakra elements even though we did not see him doing so. but it's clearly stated in the manga that all rinnegan users can and just because we didn't saw it doesn't mean it's not there. second, stop ignoring my points and answer my question with LEGIT evidence based arguments. i told you to explain to me how he can withstand shinra tensei and chibaku tensei. not come up with childish questions like 'are you telling me minato couldn't avoid it?'. ok so you think minato can avoid them i presume. where is the evidence?
and yes naruto has surpassed minato. he improved minato's techniques by leaps and bounds, became a sage at a mere age of 16, and defeated pain and became a hero in the village. this especially is a parallel to minato stopping kyubi, only he was much older and died in the process. so yea. naruto surpassed minato.
6. exactly, 4th died and had less time to improve it. unlike jiraiya. and once again you blindly assume that jiraiya can't hit those giant rasengans. say, if minato was fighting pain, all his chakra based attacks would get absorbed too, not just jiraiyas. and you keep falling back the same old ftg technique. lol. any other jutsus we saw that minato can do besides ftg, dds, and rasengan? 3 jutsus so far won't get him on my book.
7. good.