Kakuzu's gian isnt like a lightening bolt which happens in an instant,it's a continous surge of lightening,and it was met by another raiton jutsu which is raikiri,
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the heat produced from these 2 if they were anything close to normal lightening should have done much more than simply burn off those gloves. Zetsu said that it was on a whole other level than simply manipulating one's chajra,which is what kakuzu's gian coms from,so it's not natural lightening. The heat fact was gotten from the web,not that scan. Also joki boy's explosion melted the gold gaara hid in his sand,which means the heat produced was over 1000 degrees celcius,yet gaara had no trouble with it. If the heat from gian was anywhere near that,kakashi would have lost much more than his gloves.
Slow trap?,deidara while flying is a lot faster than kakuzu,yet the trap formed around him so fast he didnt even know until he was covered. Note that he was in the air,and thus gaara had to move the sand from either thr ground or the ones infronf of him to get behind him. Here kakuzu is on the floor,directly on the sand,and kakuzu's domu or threads arent breaking through anything,if he is using domu then he cant use his threads,and if he is actually able to punch through the sand,by the time he gets through all that sand,he would have been sealed up.
Gaara does not have to use that amount of sand to block the wind mask at all,he used that much to block c3 which was a village buster,the wind attack cant destroy a forest,a sand tsunami takes nothing out of him. And like i said,he can easily cut off part of the sand if he sees that the masks are flying over it,and chase them. Also gaara can attack and defend at the same time,and kakuzu can not use doton domu and another mask together,so if he is ttacking with the masks,he leaves himself open to a sand burial.
They avoided choji's palms because he attacked them from above and they could hide underground,gaara's sand arms come frm underground and they can aome from anywhere,ever under their feet
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,also like i said,gaara can make several,if they are dodgin one another gets them from behind,they cant go underground cuz they will be killed very easily,they dont fly very fast so that wont help them either.
How will kakuzu know where the sand eye is?,gaara can hide it easily.