Deidara slowly moved out of the way of kamui and got his arm torn off, yet you're saying that raikage with lightning armour, wouldn't be able to escape?
It's lightning armour and he pushes it further with body flicker which is what is said to be apart of swift chakra so his movement speed is instant. Yes, kakashi could track him but his body wouldn't be able to keep up.
Raikage didn't run into Ameterasu, he just saw the opportunity to hit sasuke and didn't care if he hurt himself in the process because, sasuke needs to be killed and he knew that. Saying he acts with/o thinking is like saying lee does then because he entered 5th gate on gaara which damaged him greatly. Point being, if you have to do something either to prove something to yourself or for the good of the people around you, you wont care if it hurts you in the process.
Pain didn't have a strategy against Jiraiya and look what happened. He had the power to kill Jiraiya and knew how to fight and knew his abilities well. Raikage is a power house with lightning armour, tailed beast level chakra, it
taking high, high rank attacks to damage him and the dude cut his own arm off and didn't even flinch.
He has wind so lightning Armor isn't a problem? That makes no sense, he may have wind techniques but it's useless if he can't hit him with them.