Experience before type rating is not an issue, many airlines have been doing this for decades. The problem is that airlines with shady training departments (if you don't crash on V1-cut, you are captain material) put people with such low overall experience in a left seat of a 60 ton jet.
I doubt 2500 hours of multi-pilot flying (assuming he got command shortly before the accident, which may not be true) is enough to be captain on an aircraft of this size and complexity.