Since we honestly don't know what Bobert's problem is...no, let me rephrase that.

Since we honestly don't know what THIS problem of Bobert's is, I think we have to wait for the MRI results.

I rephrased that because we know what Bobert's problem(s) is/are, it's just this specific one we're unsure about. I mean, when I first saw this thread title my reaction was, "Yeah, we know that and what else is news?"