is it possible that the steam coming from Fukushima is melted plutonium and uranium without iodine increase

Looking at Arnier's video, he talks about fuel rods melting, and therefore evaporization of uranium/plutonium. Ish't that considered kind of "passive release" of those elements versus active fissioning in a reactor? That may explain why the radioactive iodine remains fairly low while maybe some of the heavier elements which are exposed to the air/heat in the fuel rots pools are getting relased, I therefore conclude that the recent results of low I131 and cesium do not really paint the real picture. It is no longer a matter of active fissioning, rather constant release of radioactive steam to begin with. Does that make sense?
Therefore we are in a false sense of "security".
Thus, all this recent dark clouds etc...I can imagine that the constant steam relased in Fukushima goes up in the sky, follows the jetstreams and then it kind of accumulates to clouds since the presence of the particles itself will maybe slow down the speed in which they travel, kind of a "rush hour" slow down of particles, but due to that a limited dispersion in the space of the atmosphere. Does that make sense?
I also think that it takes about 10 days after a major release in Japan for the heavier cloud stuff to show up here in California.
If the particles accumulate in a dense field in the atmosphaere, the rush hour jam, then it makes sense that spikes hit California more heavily once they come with the jetstream. Kind of like traffic on highway 4.