Lol at the bold part. What people seem to forget is that the only time ninja's have used summons is when their opponent have also used one to counter theirs. Summonings are not effective against ninja's most of the time because a ninja can easily dodge anything a summoning can do but also the summonigs are very vulnerable to a ninja's attacks.
Secondly summons take up huge portion of a ninja's chakra depending on the size and quantity of the summoning. Jiraiya summoning all those toads will backfire on him greatly. Firstly it will no doubt take up much of his chakra. Secondly he wouldnt be able to get into sm because the little chakra he has left from summoning an army of toads will easily get pushed aside by the natural energy, because he doesnt have enough chakra to balance it out.
Thirdly, does summoning would surely die if hidan gets blood and i have no doubt in my mind that hidan can easily get blood out of these summonings