Kudos on the diagnosis, remediation and trusting your gut when told he would not learn how to read. It's sad to think about how many parents would believe the teacher if she said this about their child.
Your son's MAP data paints an impressive picture when you look at the increases in his percentiles from before and after diagnosis/remediation. Before I summarize that, I wanted to clarify something.
Did you mean his winter or mid-year 2nd grade scores were 187 for math and 181 for reading? If not, I'm a little confused about end of first to beginning of second and why there's a big difference between beginning of second and fall of second.
Just scratching my head a bit.