A couple of things. First, I am very open to learning. It is my life. However, I am very careful to learn from people who know things. I try to be a critical thinker, and as a result, I don't accept substandard opinions or arguments. Many of the arguments tried in here (on both sides) are so factually weak, or logically weak, they don't even deserve to be read, much less to be responded to. However, there are some good arguments on both sides. We need to be able to sift through the junk and see the good stuff.
Second, Wallace's treatment of 1 John 5:7 says nothing about his knowledge of Greek grammar. The debate in 1 John 5:7 is not about grammar at all. I think that even TCassidy, who supports the inclusion of 5:7, would acknowledge that the debate is not about Greek grammar, but rather about manuscript transcription and transmission.
Third, you say Wallace supports its removal from the passage. That is a bad type argument becuase you have smuggled your conclusion into the argument. The truth is that the debate is about including it. Wallace does not support its removal; he says it was never there to begin with. Wallace, along with most scholars (not all), believe that 1 John 5:7 was later added in, and there is considerable weight to that argument, though it is not incontrovertible. Whatever the case, it is not about Greek grammar at all. I am inclined to believe that it should not be there, based on the grammar and argument of the passage, and the weak mss support for it. Others disagree with me and that is fine. TCassidy can make a very thorough argument why it should be included. I really don't care. The doctrine of the Trinity does not rise or fall on that verse.
Who do you think is a greater Greek scholar than Wallace today? Give us an idea of your qualifications to talk about Greek. Tell us how much Greek you have taken, what texts you are familiar with, etc. In short, tell us why we should take your opinion about Greek over anyone else's? (I am not saying we shouldn't. You may have great qualifications to talk about Greek. Tell us what they are.)