I suppose the Raikage knows how the treasures work since they were in Kumo's possession. Having said that, i don't think he would end up being caught by the one that seals people (don't remeber the name).
I think the 3rd Raikage wins not only because of that but also because they're more or less stationary, using words in battle in order to trap the opponents souls, something that would cause their downfall in this case. Plus, they can't hurt him so...