But first He must suffer may things and be rejected by this generation. Every eye will see Him, is not declaring His mode of entering the world, it is declaring the ultimate victory and acceptance He will achieve. He went to Heaven and sits at the right hand of the Father. Jesus said that He came down from Heaven, went up into Heaven and was at that very moment, in Heaven. Jesus did not mean that He was in the sky.
Water has many meanings.
You said that the clouds represent purified people. The cloud is a symbol of the people prepared for the Lord. 2000 years ago, it was John's foundation. This of course, is not salvation nor was I presenting it as such. John's baptism was a relative, conditional sanctification until the baptism of the Holy Spirit arrived.