With Etan going missing the one single day he is actually alone on the street... could mean someone was already targeting him.. and just waiting for an opportunity.
Yes, and Ramos (a known, convicted pedophile who liked boys who looked like Etan) was dating a woman (she told authorities that she broke up with him because he had molested her son - she believed he had gotten involved with her just so that he could do so) whom the Patzes were paying to walk Etan to school during a 2-month long bus strike.
Years later, Ramos recited every stop on Etan's bus to an informant in prison.
The first day that the buses were running again, Etan disappeared while walking alone to the bus, a distance of less than 2 blocks, in a straight line.
The day that Etan disappeared was the first day that Ramos's girlfriend was not walking him to school.
Ramos would obviously have known that his girlfriend was not going to be going to her 8AM job that morning, and there are reports that he had met Etan.
Therefore, it is not much of a stretch to believe that a known pedophile would lurk along the route of a child he was attracted to when he knew that child would be there.
All that remains is the introduction of opportunity, in the form of Etan having been unexpectedly allowed to walk the route alone, and you have an impulsive crime.
Since it appears that Ramos MAY have done some odd jobs for Miller and MAY have had a key to his basement shop, which was along Etan's route, and was in a place with which Etan was familiar, and where he felt safe (from attending or visiting play group and helping Miller there), it isn't much of a stretch to believe that Ramos, who was able to entice boys into his bus without any trouble, could call Etan down into the basement, after which point anything could have happened, and Ramos could have disposed of Etan's body any number of ways that did not entail burying him in the floor (such as putting him out for the garbage - how much did he weigh? Fifty pounds?).
There is some mystery here, but not too much, I'm afraid.