Well, I think..... That an E1 is a trade rumor that Eklund feels is not significant and the trade will probably not happen. With an E5, Eklund is trying to show that this trade is more than a rumor, and it is a strong possibility that it happens.
In reality, it does not matter how he rates them. They are all mostly BS and you should see them as being E1's. That is unless many other sources are saying the same thing, in which case he would following them and just jumping on the bandwagon so to speak.
I want to say that he is probably the least reliable resource out there for trade rumors.