On the subject of requiring AS4 clears to become a Mentor...that would probably end up being very problematic.

For one, it would drastically reduce the number of available mentors (far more than the supposedly stringent requirements that will be in place in 3.2). But more importantly, it would mean that the only available mentors likely catered to a very specific, progression-oriented mindset, as current Savage is far more difficult than anything the game's ever seen. Not all players like that mentality, though, and it wouldn't be very useful to most new players.